RM6785: Cleanup audio packages

* audio_policy.stub, libaudiofoundation.vendor are unneeded
* libbluetooth_audio_session gets compiled along with audio.bluetooth.default
* libalsautils gets compiled along with audio.usb.default

Change-Id: I6f441eb907769e1c0db0ebef5eca74e75600d527
1 file changed