PBAP: Use ACTION_CONNECTION_STATE_CHANGED intent

* Use ACTION_CONNECTION_STATE_CHANGED to broadcast connection state
  change to comply with BluetoothProfile interface requirement
* Use BluetoothProfile.STATE_* variables to represent connection states
  for PBAP profile

Bug: 63873163
Test: Connect to car kits
Change-Id: I101eac613fbe152c1c079cc7e31ce77847d963f3
1 file changed