audio: Implement GetAudioConfig for HAL 2.1 am: 0b12cea833 am: b7e7872798 am: 68facba64f am: f46a812e58

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1608076

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3de6a10e07f221f67d8389e0dc297c307bba34a4