Merge "Headless: fix system update notification" into udc-dev am: 26633c8cb0 am: 2242d685c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22741446

Change-Id: I1478ef30e5c0ec0e206c06ffbfa8304fc2fd930b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>