arch/arm/src/stm32/stm32_oneshot.c:
arch/arm/src/stm32/stm32_oneshot.h:
arch/arm/src/stm32/stm32_oneshot_lowerhalf.c:
arch/arm/src/stm32/stm32_dbgmcu.h:
* Fix nxstyle errors.
arch/arm/src/stm32/stm32_lsi.c:
* Fix nxstyle errors.
* Also a minor grammar fix in a comment: add "in" to "setting the
LSION bit in the RCC CSR register."
* Simplify EINTR/ECANCEL error handling
1. Add semaphore uninterruptible wait function
2 .Replace semaphore wait loop with a single uninterruptible wait
3. Replace all sem_xxx to nxsem_xxx
* Unify the void cast usage
1. Remove void cast for function because many place ignore the returned value witout cast
2. Replace void cast for variable with UNUSED macro