Merge "RingtoneManager: verify default ringtone is audio" into tm-dev am: 763762e2ec

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

Change-Id: Ief934e66580c718e04a6224be5991f482b6dc2b1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>