Update the layout of AppDataUsagePreference

The layout of AppDataUsagePreference including a progressbar, that's not common pattern in SettingsLib.

Bug: 365506467
Bug: 370456736
Change-Id: I28d25724067d85f8d37c3b5273d38055ba7021a6
Test: atest
Flag: EXEMPT bugfix

src/com/android/settings/datausage/AppDataUsagePreference.java

@@ -38,6 +38,7 @@ public class AppDataUsagePreference extends AppPreference {
     public AppDataUsagePreference(Context context, AppItem item, int percent,
             UidDetailProvider provider) {
         super(context);
+        setLayoutResource(R.layout.preference_process_stats);
         setKey("app_data_usage_" + item.key);
         mItem = item;
         mPercent = percent;