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

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

Change-Id: I66a489672d148dec0989e1b9e65239a945f2d87d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>