And create PreferenceControllers for each setting
The page is still pretty janky and controllers are invoked manually.
Next CL will clean these up.
Bug: 32953042
Test: TODO
Change-Id: I1d7478324f5de4fdb464d79f89086f7e79c0ee67
In the new design, bluetooth preference is not MasterSwitchPreference
any more. This cl creates BluetoothSwitchPreference while reuse the
BluetoothEnabler.
Future cl will remove the BluetoothMasterSwitchPreference when P
feature is finalized.
Bug: 69333961
Test: RunSettingsRoboTests
Change-Id: Ie1f934b4e93a6758a1b0cf83bb5098585a635c2a