drivers/lcd:  Make LCD driver configuration indepently selected from NX graphics configuration.  This makes things awkward and loses some error checking but is a necessary step in order to make LCD drivers usable when the NX graphics system is disabled.

drivers/lcd:  Add support for external LCD initialization required by some board logic.  configs/zpa214xpa:  Tried to get the LCD working again unsuccessfully.  Too much bit rot I suppose.

Revert "arch/arm/src/xmc4:  Serial fix... Cannot use SR1 for RXD.  It will not work on this hardware.  This means that no more than on UART can be configured per USIC."

This reverts commit 88982df0.

Revert "arch/arm/src/xmc4/xmc4_config.h:  Add a check to doubly enforce the one UART per USIC rule."

This reverts commit 63026b78.

arch/arm/src/xmc4:  Serial fix... Cannot use SR1 for RXD.  It will not work on this hardware.  This means that no more than on UART can be configured per USIC.

configs/xtrs:  Removed the XTRS configuration This was an unverified port of NuttX to a TRS-80 simulator.  It was removed because (1) it is, as I said, unverified as well as unsupported, and (2) the TRS-80 simulation is a sub-optimal platform.  That platform includes a 16-bit ROM image and only a 48Kb RAM space.

arch/arm/src/xmc4:  Do not run at 144MHz unless BOARD_FCPU_144MHZ is selected in the board.h header file.

configs:  All NX configuration... Because of recent changes to libnx/nxfonts, Supported bit per pixel must be separated specified for NXFONTs too and need to match the select BPP for NX.

sched/semaphore/spinlock.c: Disable local interrupts in spin_setbit() and spin_clrbit() in order to avoid a deadlock condition.

STM32:  Remove usb_dumpbuffer() macro from OTGFS device. It cannot be controlled via Kconfig and therefore will not be supported.

include/nuttx/audio: Remove CONFIG_SCHED_WORKQUEUE check in pcm.h

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

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

sixlowpan: Fixes build error introduced by recent PR when routing table is enabled.

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

include/nuttx/video/fb.h:  Add definition for a Y2 color format.  I don't know if this standard but I do have 2-bit greyscale hardware so the definition is needed.

STM32 L4 USB OTGFS: Remove dumpbuffer feature added in the last commit.  I don't want in features that cannot be controlled be via Kconfig files and I do not accept debug code in the upstream GIT.  My mistake for merging it in the first place.

clicker2-stm32: Adds support for USB RNDIS device

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

USB RNDIS - Fixes minor build error while using USB RNDIS with USB debugging information enabled

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

Pass header-payload offset to application for use when the MAC layer is in promiscuous mode

* mac802154_device: When in promiscuous mode, the char driver sends the entire frame, including the MAC header.  This change adds an offset field indicating the header-payload boundary. It is set to 0 when not in promiscuous mode as the header is not passed to the application

* mac802154: Adds support for getting promiscuous mode state

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

sixlowpan: Support sending to a router that is on-link and may be able to forward the packet for us if the destination is not reachable directly

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

net/:  Fix some issues with regard to UDP broadcast handling.  This is Bitbucket Issue #77.  This commit tentatively closes the issues, subject to verification.

net/icmp and icmpv6:  Fix some errors in debug assertions introduced with last changes in this area.  Also updates a REAME.txt file

stm32f33xxx_rcc: fix CAN clock enable

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