SetupWizard: Update Location services page

* Remove usage of deprecated setLocationProviderEnabled and
  isLocationProviderEnabled
* Use BroadcastReceiver to listen for changes to mode
* Replace GPS option with Battery Saving option (there is no longer a
  mode available in Android which disables GPS)

TODO: Create CMStats entry for ENABLE_BATTERY_SAVING_LOCATION

Change-Id: I2efe69125518637ae9b7d0dce285c39dae654d4c