Merge "Metadata database now creates a new entry on acl connection events,...

Merge "Metadata database now creates a new entry on acl connection events, updates last_active_time on a2dp, hfp, or hearing aid active device changes, and exposes new function to get most recently connected devices ordered by last_active_time" am: b5b11641

Change-Id: I78ca9d34b3429c1b308b21df65d25103a6d3512f