Merge "audio: change volume only if effect updates the volume" into main am:...

Merge "audio: change volume only if effect updates the volume" into main am: 371e1ae4 am: a09957e8

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2720894



Change-Id: I6dad2543c0fda48e58a8b3313d2516469e810441
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>