Merge "Perform receiver un/registration in bg for RotationButtonController"...

Merge "Perform receiver un/registration in bg for RotationButtonController" into udc-qpr-dev am: 90bc78c2

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



Change-Id: Ic48de44c930103a1c6dccb43f2c55ee519eec0e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>