Make QS use SettingsLib's BT code

A couple of changes needed to be made to SettingsLib to support this.
 - SettingsLib needed to track ACTION_CONNECTION_STATE_CHANGED
 - The summary code needed to move from Settings up into SettingsLib
 - Added a getMaxConnectionState to CachedBluetoothDevice
    - This simplifies the states of all of the profiles into
      one.

Change-Id: I7f828f0038ad0cf39274986ece6d486d545f0286