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

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



Change-Id: I53a15f27bb81d764ba746bef8119b437d4e3a334
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>