drivers/wireless/cc1101.c:  Fix a few things that I bungled in my review of the driver mods.  Fix the logic that was dumping register contents: printf() may not be used within the OS and the syslog and debug macros may add ornamentatino to the output.  The only real option inside the OS is to buffer the data and outputing with a single syslog write (vs. many tiny writes).

    cc1101:  Changes from review of last PR.
    remove gpio
    remove  cc1101 frame len
    remove FLAGS_RXONLY flags
    add cc1101 function
    remove some waring
    add cc1101 poll function
    add cc1101 register
    add cc1101 isr read data
    add cc1101 spi deviceId
    add cc1101 init2
    add wait cc1101 chip ready
    raw init cc1101

Added ECANCELED condition to DEBUGASSERT-s checking sem_wait result

Approved-by: Gregory Nutt <gnutt@nuttx.org>

sched/wdog:  wd_start() is an internal OS function and should not set the errno value.  Reviewed and updated every call to wd_start() to verify if return value is used and if so if the errno value is accessed.

binfmt/, drivers/, graphics/:  Fix several inappropriate accesses to get_errno() that were missed in previous changes (some going back to nuttx-.23).

The existence of the network driver ioctl() method should depend on CONFIG_NETDEV_IOCTL rather than CONFIG_NETDEV_PHY_IOCTL.  The former enables the method, the later enables a subset of possible driver IOCTLs.  This change should be basically a no-operation.  The affected ioctl methods only support those subset of driver IOCTLs selected by CONFIG_NETDEV_PHY_IOCTL and the network logic will tolerate a nul ioctl method.

The existence of the network driver ioctl() method should depend on CONFIG_NETDEV_IOCTL rather than CONFIG_NETDEV_PHY_IOCTL.  The former enables the method, the later enables a subset of possible driver IOCTLs.  This change should be basically a no-operation.  The affected ioctl methods only support those subset of driver IOCTLs selected by CONFIG_NETDEV_PHY_IOCTL and the network logic will tolerate a nul ioctl method.

ieee802154: Simplifies notify() and rxframe() calls to a single notify() call. dataind's and all other "notifs" are now "primitives" which aligns with standard terminology

* mac802154: Adds missing breaks from case statement

* sixlowpan: Fixes bad logic where ACK is not requested if address is not a broadcast

* ieee802154: Simplification of "notifs" and "datainds" to generic primitives passed via a single notify call to the layer above the MAC

* Directories.mk should reference CONFIG_WIRELESS instead of CONFIG_DRIVERS_WIRELESS

* xbee_netdev: Network must be locked when calling sixlowpan_input

* sixlowpan: Reassembly buffer can't be freed if provided by radio driver

* sixlowpan: Don't free IOB if there is an error processing it as the MAC will try to pass it along to another receiver

* ieee802154: Adds basic logging to ieee802154_primitive.c

* Minor fixes after rebase

* xbee: Adds AT query timeout to retry if XBee doesn't respond to request

* same70-xplained: Adds Xbee support. Makes mikroBus slot Kconfig 'choice'

* mac802154: Removes unused function declaration

* drivers/mrf24j40: Fixes compilation error using . operator rather than -> operator

* mac802154_device: Changes a few mac802154_primtive_free's to ieee802154_primitive_free() and changes notif to primitive in a couple places.

* mac802154: Adds promiscous mode logic to bypass parsing of incoming frames. MAC char device also checks for promiscous mode and passes whole frames including header and FCS to the application if promiscous mode is enabled.

* sixlowpan: Fixes logic to correctly check if packet is large enough to include header.  This would cause packets to be considered too small when they are sufficiently sized.

* sixlowpan: Fixes forwarding logic to use forwarding device rather than received device to look up destination link layer address

* net/ipforward: Fixes typo that caused build error when IP forwarding was enabled with CONFIG_NET_ICMPv6_NEIGHBOR enabled as well.

* configs/same70-xplained: Simple spelling fix

Approved-by: Gregory Nutt <gnutt@nuttx.org>

drivers/wireless/ieee80211:  Fix typos and spelling errors as needed for Photon build.

kthread_create():  Rename kernel_thread() to kthread_create() for better naming consistency with task_create() and kthread_delete().

fs/vfs:  Add new internal OS interface nx_read().  nx_read() is functionally equivalent to read() except that it does not modify the errno variable and it is not a cancellation point.  Changed all references to read() in the OS to nx_read().

Adds OS internal function nx_write() which is functionally equivalent to write() except that it does not set the errno variable and do not cause cancellation points.

Adds OS internal functions nx_send(), ns_recv(), and nx_recvfrom() which are functionally equivalent to send(), recv(), and recvfrom() except that they do not set the errno variable and do not cause cancellation points.

    Change all calls to mq_receive() and mq_timedreceive() in the OS to calls to nxmq_receive() and nxmq_timedreceive(), making appropriate changes for differences in return values.

    sched/mqueue:  Add nxmq_receive() and mxmq_timedreceive() which are functionally equivalent to the standard mq_receive and mq_timedreceive() except that (1) they do not create cancellation points, and (2) the do not modify the application's errno variable.

    Change all calls to mq_send() and mq_timedsend() in the OS to calls to nxmq_send() and nxmq_timedsend(), making appropriate changes for differences in return values.

    sched/mqueue:  Add internal function nxmq_send() and nxmq_timedsend() that are equivalent to mq_send() and mq_timedsend() except that they do not create cancellation points and do to not modify the errno variable.

    Replace all calls to sigqueue() in the OS proper with calls to nxsig_queue() to avoid accessing the errno variable.

    sched/signal:  Add nxsig_queue() which is functionally equivalent to sigqueue() except that it does not modify the errno variable.

Adds new OS internal functions nxsig_sleep() and nxsig_usleep.  These differ from the standard sleep() and usleep() in that (1) they don't cause cancellation points, and (2) don't set the errno variable (if applicable).  All calls to sleep() and usleep() changed to calls to nxsig_sleep() and nxsig_usleep().

Squashed commit of the following:

    Change all calls to usleep() in the OS proper to calls to nxsig_usleep()

    sched/signal:  Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.

    sched/signal:  Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.

sched/semaphore:  sem_trywait() modifies the errno value and, hence, should not be used within the OS.  Use nxsem_trywait() instead.

sched/semaphore:  sem_timedwait() is a cancellation point and, hence, cannot be called from within the OS.  Created nxsem_timedwait() that is equivalent but does not modify the errno and does not cause cancellation.  All calls to sem_timedwait() change to calls to nxsem_timedwait() in the OS.