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 am: ea26291b am: 0c2caf7b

Change-Id: I4724b0b007fd95b478f1310e9c3b1597728a47bf