- Add board specific logic to altair modem dirver
- Fix issue that SPI4 RX frequency violated AC Spec
- Remove dummy buffer in altair driver
- Fix priority of SPI transfer task is too low
- Remove unnecessary configuration
- Modify timeout value for RX ready
- Fix minor bugs
* 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
