Enable bandwidth module from stats service.

During systemReady(), tell netd to enable bandwidth tracking module,
which is used to provide detailed stats and controls.

Change-Id: Iecfd8b17a3b90f5a817d731fbe1c71777681ed6e
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 19e9a67..afff7e24 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -3804,6 +3804,8 @@
                 "dream_timeout";
 
         /** {@hide} */
+        public static final String NETSTATS_ENABLED = "netstats_enabled";
+        /** {@hide} */
         public static final String NETSTATS_POLL_INTERVAL = "netstats_poll_interval";
         /** {@hide} */
         public static final String NETSTATS_PERSIST_THRESHOLD = "netstats_persist_threshold";