Merge "[Output Switcher] Add unmute function on volume icon" into udc-dev am: 528dfcfe am: 6cfd8d8a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22290782



Change-Id: I5494e185a6d7bb8882196e075ca6c08ca16645cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>