Bluetooth: Update Connected Icon properly.

- add connected device list to maintain
  connection status for each device
- add device when state has changed to connected
- for fake broadcast check device in list before adding
- remove device when disconnect is broadcast for device
- cleanup device list when bt is turned off.

Change-Id: I2236a0fcab884fbf5134fbc67e05d27d5a6e837f
CRs-Fixed: 722184