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

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

Change-Id: I10989ff35d788d75e79f3bb3d85e72ba5fdc25ad