Add Quick Settings USB Tether tile (2 of 2)

Patch Set 8: Make tile dynamic

- Thanks to Björn Lundén for the drawables

Change-Id: I414848f6cb8a789d0b5edfcb79ab53cb85ebc20e

Author: burnsra

core/java/android/provider/Settings.java

@@ -2591,6 +2591,13 @@ public static void setShowGTalkServiceStatusForUser(ContentResolver cr, boolean
          */
         public static final String QS_DYNAMIC_IME = "qs_dyanmic_ime";
 
+        /**
+         * Quick Settings Panel Dynamic Tiles
+         *
+         * @hide
+         */
+        public static final String QS_DYNAMIC_USBTETHER = "qs_dyanmic_usbtether";
+
         /**
          * Quick Settings Panel Dynamic Tiles
          *