Merge "audio: Add AIDL definitions for Playback/RecordTrackMetadata" am: f96d2ef9b6 am: 6fc603725c am: 057468476e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1936041

Change-Id: I22017d09cc8b00a6573eacb4a5726c10965851eb