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

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

Change-Id: I3a4799fe094aee9a0694ed6df5b8587a5a2f7c1f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>