Add device build information in the backup stage

Insert the device build information in the battery optimization mode
backup stage, such that we can use it to decide whether we should
restore the data in the targeted device or not

Bug: 192523697
Test: make test RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.fuelgauge.*

Change-Id: I3ab76e013ea9aca4d336a62e0c7cb6882c5b5085

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

@@ -188,4 +188,14 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
     public Set<String> getIgnoreScreenOnTimeTaskRootSet() {
         return new ArraySet<>();
     }
+
+    @Override
+    public String getBuildMetadata1(Context context) {
+        return null;
+    }
+
+    @Override
+    public String getBuildMetadata2(Context context) {
+        return null;
+    }
 }