Merge "AHAL: support volume control for USB audio HAL." am: 0abca2170b

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2461293

Change-Id: Ia3194a312ecbb90d9b2cc19dcf4a3c31d374a4d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>