Merge "Updating SysUI state when back enabled/disabled state change" into...

Merge "Updating SysUI state when back enabled/disabled state change" into rvc-dev am: d71e76fd am: 3961746e am: cf4a59b6 am: 099d4ae1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11965840

Change-Id: I3fa89d90934b13db032dcd97680bf17a97f07869