Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into tm-dev am: 92c1b9e850 am: 2854be216c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19697540

Change-Id: Ie99b5835676329c9777c052ed3062f36595d476b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>