Merge "Limit the size of NotificationChannel and NotificationChannelGroup"...

Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into tm-dev am: 92c1b9e8 am: de5204f2 am: 1bc3cdfb

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



Change-Id: If9f4d61703b7a98555daaa09014fc2151782d1be
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>