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

Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into rvc-qpr-dev am: a15093de am: 5415ede5 am: dc9fe11d am: eb814b0f am: b94d473e am: 3f8a9b6d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19696124



Change-Id: I34173eb4b91fdb4e2d92cbee636d92f687d71a70
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>