Merge "Prevent apps from creating blocked channel groups" into rvc-dev am: fc06439710 am: 3e759cc3a5 am: 5e918c2148 am: 2558b40966 am: a27683f3b3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16624024

Change-Id: Iee98d1a28a2fa64ca911495ae786ca2fe46b4d36