Merge "Disable group volume control bar in output switcher systemUI dialog" into sc-dev am: 3245ab13 am: e304c72e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14781656

Change-Id: I670bece3c3f403b4d3e3055f8da314aa77cf40d6