Combine system apps to one item in the battery usage app list.

Bug: 262952385
Test: 262952385
Test: maunal
Change-Id: I078677b13a22f5e2f8f194bb5d5259f8c54c6b1e

src/com/android/settings/fuelgauge/PowerUsageFeatureProviderImpl.java

@@ -26,6 +26,7 @@ import android.util.SparseIntArray;
 import com.android.internal.util.ArrayUtils;
 import com.android.settingslib.fuelgauge.Estimate;
 
+import java.util.List;
 import java.util.Set;
 
 /** Implementation of {@code PowerUsageFeatureProvider} */
@@ -70,6 +71,11 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
         return true;
     }
 
+    @Override
+    public List<String> getSystemAppsAllowlist(Context context) {
+        return null;
+    }
+
     @Override
     public boolean isLocationSettingEnabled(String[] packages) {
         return false;