Refactor MobileDataPreference

1. Remove it and change it to SwitchPrference
2. Build MobileDataDialogFragment to show dialog when needed
3. Create controller for it to decide when to launch the dialog

Bug: 114749736
Test: RunSettingsRoboTests
Change-Id: I02b9662c5829e765f2c71d10ed951d792cf7aaa1
10 files changed