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

Merge "Limit the size of NotificationChannel and NotificationChannelGroup" into sc-dev am: 6457ae8d am: d9e939ee am: a3428220

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19697196



Change-Id: I817e225487b74cb7402a78ebc607b8d4653b6a58
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>