Merge "Camera / UidObserver: Add the ability to subscribe to specific UIDs" into udc-dev am: 4a8548b544

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22829063

Change-Id: I56c711dd7151e4843f164df0d8baba2fd4fa901c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>