Move unrestricted data summary to DataSaverController

DataSaverController currently used in 2 pages,
- Network & internet > Data Saver
- Apps > Special app access

This helps unify the logic, and instead of showing on "Special app
access", this summary shows on "Unrestricted data" is make more sense.

Bug: 280280596
Test: Manually on above pages
Test: Unit test
Change-Id: Ia151ed8179a250f8f20cc5041f9383fffebdab10

src/com/android/settings/applications/specialaccess/SpecialAccessSettings.java

@@ -21,6 +21,10 @@ import static android.app.admin.DevicePolicyResources.Strings.Settings.MANAGE_DE
 
 import android.app.settings.SettingsEnums;
 import android.os.Bundle;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
@@ -46,6 +50,12 @@ public class SpecialAccessSettings extends DashboardFragment {
                 MANAGE_DEVICE_ADMIN_APPS, R.string.manage_device_admin);
     }
 
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        use(DataSaverController.class).init(getViewLifecycleOwner());
+    }
+
     @Override
     protected int getPreferenceScreenResId() {
         return R.xml.special_access;