audio: Implementation of audio I/O, part II am: 4f5d3f12f5 am: 4af7cb62b4 am: 43f77e934b

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2199346

Change-Id: Id89b9441921e8de330530987bd18db38843b2cc2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>