Merge "Make the notif panel focusable during screen off so touch events don't go to the app behind." into sc-dev am: ce9883b6 am: 5270a995

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15097911

Change-Id: I7edabad0dfc3a0febcf0391432dc5e8b7446ec42