some fixes after modifications:
1. removed the use of waiting_command_t
2. fix assert for HCI write_eir command
3. fixed the crash upon handling command status event when trying to free to the HCI command buffer
4. fixed the issue in transmitting HCI vendor specific commands
5. fixed the lost command complete callbacks for HCI commands LE_RAND and LE_ENCRYPT
created common Kconfig for common flag of nimbble and Bluedroid
fix compile error
created common cfg file for controller
fix the compilation error on tip of master
added common controller flags and fixed compilation error
sdkconfig rename for target specific
