Remove TetherUtil functions which are no longer needed.

Change-Id: I8559a2aaffa44e165d4e5e9070a85f23ed02b58b
diff --git a/src/com/android/settings/WirelessSettings.java b/src/com/android/settings/WirelessSettings.java
index 061d059..ce0766b 100644
--- a/src/com/android/settings/WirelessSettings.java
+++ b/src/com/android/settings/WirelessSettings.java
@@ -319,7 +319,7 @@
 
         final boolean adminDisallowedTetherConfig = mUm.hasUserRestriction(
                 UserManager.DISALLOW_CONFIG_TETHERING);
-        if (!isAdmin || (!cm.isTetheringSupported() && !adminDisallowedTetherConfig)) {
+        if (!cm.isTetheringSupported() && !adminDisallowedTetherConfig) {
             getPreferenceScreen().removePreference(findPreference(KEY_TETHER_SETTINGS));
         } else if (!adminDisallowedTetherConfig) {
             Preference p = findPreference(KEY_TETHER_SETTINGS);