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

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



Change-Id: I1c07c27d4d9dfc5b1785f32a13d7b837fcb27343
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>