Move Automatic System Updates from Developer Options to System

- Move the preference to the system xml file.
- DisableAutomaticUpdatesPreferenceController should not
inherit from the developer preference controller now since it's not used
in developer page anymore. Instead, just use toggle preference
controller for changing the state.
- Rewrite the test cases based on new controller.

Test: The ui works well and search can navigate to correct path.
Fix: 196001125
Change-Id: Iaea3e11d9cdbfa073ebd41bc3c84356d564c7e71

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -481,7 +481,6 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new PictureColorModePreferenceController(context, lifecycle));
         controllers.add(new WebViewAppPreferenceController(context));
         controllers.add(new CoolColorTemperaturePreferenceController(context));
-        controllers.add(new DisableAutomaticUpdatesPreferenceController(context));
         controllers.add(new SelectDSUPreferenceController(context));
         controllers.add(new AdbPreferenceController(context, fragment));
         controllers.add(new ClearAdbKeysPreferenceController(context, fragment));