Change log:
- Add Keypad driver for RDA8910 SoC
- Add IOMux driver RDA8910 SoC
- Add support for 1-bit SD mode
- Add API to check if BT device is connected
- Add API for fota interface
- Add API to set reboot callback to control system reset by application
- Add support to configure SSL client certificate and key
- Add fota abort API
- Fix tcflush not working
- Improve circbuf api speed
- Fix http client stale connection not checked
- Fix printf issue on RDA8910
- Fix reentrant issue on RDA8910
- Fix signal/rssi value not updated when network in searching
- Fix API to change network mode on LTE modules
- Fix BLE scan crash on RDA8910