Merge "Prevent apps from creating blocked channel groups" into rvc-dev am: fc06439710 am: 3e759cc3a5 am: 5e918c2148 am: 2558b40966 am: 3bbae40ae9

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

Change-Id: Iefca645ec5505e40e884cc20e9bac2a1cdc79384