Merge "[Output Switcher] Disable volume control if route is volume_fixed" into...

Merge "[Output Switcher] Disable volume control if route is volume_fixed" into tm-dev am: 25639f1b am: 53661edb am: 2b03bdfc am: 4bf6e880

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18756771



Change-Id: I46b1bdff0cebc3430ca914e1d7fa88a012c79542
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>