Networking:  Clean up some naming that has bothered me for a long time... There are no interrupts and no interrupt handlers in the network.  There are events and event handler (there used to to be interrupt logic in there years ago but that is long, long gone).

Networking:  A placeholder for some missing logic in the previous change related to monitoring network status for dup'ed sockets.  If one of the dup'ed socket's is closed, then network monitor resources associated with that one socket must be recovered.  Also, in the event that socket is being used on one thread, but then closed on another, any threads waiting for events from the socket should be informed of the closure.  That latter requirement is not implemented because current data structures do not support it.

Networking:  Fix a runaway recursion problem introduced the previous fixe for shutting down dup'ed sockets.

Networking:  TCP disconnection callbacks are not retained in a list.  This will support mutiple callbacks per lower-level TCP connection structure.  That is necessary for the cae where a socket is dup'ed and shares the same lower-level connection structure.  NOTE:  There still needs to be a call to tcp_start_monitor() when the socket is dup'ed.

Networking:  Move two more TCP specific files from inet/ to tcp/.  There is other TCP-specific logic in inet/ that should be moved sometime, but those are more entangled.

Networking: Move net/inet/net_monitor.c to net/tcp/tcp_monitor.c in preparation for design change to fix monitoring of duplicated sockets.

stm32_hrtim: add DMA configuration

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

work_queue() must cancel existing work prior to queuing new work, otherwise the work queue can become corrupted.  Problem noted by Pascal Speck.

stm32_dac.c: support external triggering for DMA transfer

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

Master

* stm32f0/Kconfig: remove references to HRTIM

* STM32F33: missing SYSCFG CFGR3 definitions

* stm32_hrtim.h: remove redundant definitions

* stm32_hrtim.c: fix DAC triggers configuration

* stm32_hritm.c: warning message when default value selected

* stm32_hrtim.c: missing master timer logic

* stm32_hrtim.c: add more assertions

* stm32_dac.c: fix conditional

* stm32_dac.c: conditional logic for timer triggering

* stm32_dac.c: fix TSEL configuration when HRTIM

* stm32_dac.c: unnecessary condition

* stm32_dac.c: DMA request remapping

* stm32_dac.c: fix commpilation errors

* stm32_dac.c: add DMA buffers initialization logic

* stm32_hrtim.c: enable DAC triggering

* analog/comp.c: fix compilation errors when poll disabled

* stm32_hrtim.c: remove doubled assertions

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

eMMC/SD and USB support for LC823450

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

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

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

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

Simulator: Adds necessary functionality to build Simulator under ARM Linux. Tested only on Raspberry3. Currently setjmp/longjmp do not save/restore floating point registers.  Patch provided by Bitbucket user nbkolchin.

6LoWPAN:  The original, Contiki-based design used only a single buffer for reassemblying larger packets.  This could be a problem issue for hub configurations which really need the capability concurrently reassemble multiple incoming streams concurrently.  These was also a design issue in that the reassembly buffer could be corrupted by outgoing packets.  The design was extended to support multiple reassembly buffers, each associated with the reassembly tag and source address.  This assures that there can be be no corruption of the reassembly once it has started.

STM32L4 DAC: report transfer as completed in DMA callback.  Without this even O_NONBLOCK writes block the calling task if DAC was using DMA.

drivers/audio:  Fix naming of configurations to be compliant for vs1053 audio driver.  One file was not saved before last commit.