Add enabled time to dump output

Ex:
Bluetooth Status
  enabled: true
  state: 12
  address: F8:CF:C5:CE:F5:69
  name: AOSP on Shamu
  time since enabled: 00:00:32.999

Bug: 27294154
Change-Id: Ie65964411e2095434a082f3d988133190c1f2f59