Create a builder for audio_util Metadata and migrate off bundles am: 1b69ac43ae

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Bluetooth/+/1543894

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8bc564ab843e2b7eb3e7bcc31a9d6e8e7c24c030