Merge "Send system user broadcasts in headless system user mode." into tm-qpr-dev am: 8c72c3c9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20965081



Change-Id: I0433c3ca2d848df8d169cb8596ef13c6f2267d94
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>