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: I026ed0b529bd0def446b88b459ec1f2c2e82173f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>