Introduce SecondaryDisplaysPreferenceController

- Create new SecondaryDisplaysPreferenceController
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: Ib1a7164b4e8fcf9ae8af96290d2baa33e25648f7

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

@@ -389,7 +389,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new WindowAnimationScalePreferenceController(context));
         // transition animation scale
         controllers.add(new AnimatorDurationScalePreferenceController(context));
-        // simulate secondary displays
+        controllers.add(new SecondaryDisplayPreferenceController(context));
         // smallest width
         controllers.add(new ForceGpuRenderingPreferenceController(context));
         controllers.add(new GpuViewUpdatesPreferenceController(context));