Update FakeUid to implement getForegroundServiceTimer

Simple change. Override the getForegroundServiceTimer method in FakeUid

Test: bit FrameworksCoreTests:com.android.internal.os.BatteryStatsNoteTest
Bug: 38313557
Change-Id: I8a3142e61ed67109629c683384734f749eaafb3f

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

@@ -208,6 +208,11 @@ public class FakeUid extends Uid {
         return null;
     }
 
+    @Override
+    public Timer getForegroundServiceTimer() {
+        return null;
+    }
+
     @Override
     public long getProcessStateTime(int state, long elapsedRealtimeUs, int which) {
         return 0;