audio HAL: Minimal example implementation am: df5adfde15 am: 88a81f47c6 am: 09c9ec4195

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2190587

Change-Id: I4e74269852811ef277f49de4d8f7a3fba3d8432f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>