Use separate HAL interfaces for A2DP source and sink roles.

Both use the same structs for APIs and callbacks, but now
source and sink mode can operate independently with separate
Bluetooth profile services in the framework.

An extra callback btav_audio_config_callback is used for reporting
audio configuration for A2DP sink role

Change-Id: I6e8172b66ff95e61721d1c35790609b7ae2be030
2 files changed