Merge "Perform receiver un/registration in bg for RotationButtonController" into udc-qpr-dev am: 90bc78c228 am: 180a408c34

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24753686

Change-Id: I1d35b9c9dcd33a006dfcfd0342aec43ceb348957
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>