Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into rvc-dev am: 04ccf69df1 am: 6155a1779b am: c08dd8f0a8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19697197

Change-Id: If54a305ad52e9c8d7d6d96849c08722a6b063007
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>