VoiceDialer: Allow App to load if Bluetooth is off

Added a check to see it bluetooth is enabled.  If disabled then
allows app to start and uses mic.  If bluetooth is enabled then
will check for connected device.  If none will use the mic,  if
device is connect then will use it.

Change-Id: I4bcc510576dc668cd847e22e5e7ec9b88156c610