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: b4c75fce am: 3b30dd88 am: 409f64ee

Change-Id: I4724b0b007fd95b478f1310e9c3b1597728a47bf