Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into rvc-qpr-dev am: a15093de05 am: 5415ede546

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

Change-Id: Iab8db627059b3363c1b797a8e7c63eac5b003ac2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>