Merge "RingtoneManager: verify default ringtone is audio" into tm-dev am: 763762e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21027430



Change-Id: Ifb8a2f4a1e87278ac7df9ff7a579a64bc4a790a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>