Merge changes from topic "cherrypicker-L47600000963081744:N22400001405878786" into udc-qpr-dev
* changes:
audio: Improve testing of point-to-point connections
audio: Mitigate double receiving of the "exit" command
Audio : Add 3 VTS test cases for remote submix module
r_submix : Fix minor issues in AIDL implementation
Avoid sub_overflow_minimal in AIDL effects VTS
audio: Properly support external device port with static configs
Remove unused file EffectWorker.h
Remove the limitation of max open streams
audio: Make IConfig.getSurroundSound default implementation more robust