Composite:  Private functions need to be marked static.  Move static functions out of 'Public Functions' to 'Private Functions' where they belong.  Disable composite configuration 1 in all STM32 F1 configurations.

Composite:  Remove all dependencies on CONFIG_SYSTEM_COMPOSITE_* configuration settings.  Nothing in the OS can depend on external application settings.

Composite:  Move board_msc* interfaces from apps/system/composite to the board specific OS logic where they belong.

Socket I/F: More fixes for USRSOCK.  The good link fooled me because a critical file was not included in the link.

Socket I/F: Fix bad copy-past error.  sendto() was called the address family's send() instead of sendto().

Socket interface:  Fix some configuration chaos.  Sometime CONFIG_NET_UDP/TCP was used when CONFIG_NET_LOCAL_DGRAM/STREAM was intended.

STM32 F7 Ethernet:  Fix typo in header; Add memory sync barrier between writing to DMA TX descriptor and restarting DMA TX. Avoid calling work_queue on pollwork if it's already queued, just skip a poll cycle instead.  Nucleo-144: Fix RMII TXD1 signal, connected to PB13 not to PG14.