[Provider Model] Add Airplane-safe Networks preference

- Hide the preference when airplane mode is off.

- Reuse PrimarySwitchPreference for RestrictedSwitchPreference

- Screenshot
  https://screenshot.googleplex.com/8HiC5sc8xaqnhz5

Bug: 174022082
Test: atest -c AirplaneSafeNetworksPreferenceControllerTest
Change-Id: I06a56e8e815778cebf200c4a486c414e92f4cb87