Merge "libaudiohal: Properly notify standby state to HAL" am: 1930164eef

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2439359

Change-Id: Iee72b6adfcff231b437bc7911e980c50556f2820
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>