Merge "Remove volume_separate_notification flag" into udc-dev am: 7aa8424c am: 2aecb2f1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/23244447



Change-Id: I70ddbb0ecd7a1553a8d07b3ee47c305399edeb58
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>