MagnificationPreferenceFragment use DashboardFragment

- Move preference related logic to Controller
- Add settings:controller in xml file

Bug: 73899467
Test: manual
Test: make RunSettingsRoboTests

Change-Id: I3eaccc617c4408f50110bf1f5df3482f491f7393
Signed-off-by: rafftsai <rafftsai@android.com>

src/com/android/settings/accessibility/AccessibilitySettings.java

@@ -813,8 +813,8 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
         if (!MagnificationPreferenceFragment.isApplicable(context.getResources())) {
             preference.setFragment(ToggleScreenMagnificationPreferenceFragment.class.getName());
             final Bundle extras = preference.getExtras();
-            MagnificationPreferenceFragment.populateMagnificationGesturesPreferenceExtras(extras,
-                    context);
+            MagnificationGesturesPreferenceController
+                    .populateMagnificationGesturesPreferenceExtras(extras, context);
         }
     }