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

Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into rvc-dev am: 04ccf69d am: 6155a177 am: c08dd8f0 am: 695d9cce am: 3e7871d1 am: a2fdeeaf

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



Change-Id: I8dcde93c6143c1a5c3550b089edf71550f23aa59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>