audio: Implementation of audio I/O, part I am: 6a4872dff0 am: 1909ccc5b6 am: 9190804521 am: 54a54889c3

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2197183

Change-Id: I81afe20792c53b1ab62360471d903ee1afbc836b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>