sched/semaphore: Fix setting EINVAL in sem_post() and sem_wait()

Upstream_nucleo 144

Fixed build of SAMV71-XULT/nsh.  With the changes from 26f7b8c9 the build process of the default configuration did not succeed anymore.  This is fixed by this commit.

STM32 CAN: More fixes for compilation errors due to blind leverage of STM32L4 CAN filter IOCTLs to STM32

Upstream_nucleo 144

Upstream_nucleo 144

libc/hex2bin:  Move the portable library portion of apps/system/hex2bin to nuttx/libc/hex2bin where it can be shared with the OS internals.

 are held in the microcontrollers memory and only written to the IO-Expander.
 This reduces bus traffic and is more error-proof than the normal read-
 modify-write operation.

 Retry Mode: If enabled and an error occurs while writing to the IO-Expander the
 current transmission is automatically repeated once.

Add support for the Olimex STM32 E407

usb

Backout most of changes from 4d331ec09b2fc72636f86be628ea2f69381 and 8afe7216.  Does not work as expected.

Upstream_nucleo 144