Just use device configuration for Tethering.

Don't need extra code here if the device is configured propertly.

Change-Id: Ieb65e36c1c91a62bbb0c8619e2efb34735fbb564
diff --git a/src/com/android/settings/WirelessSettings.java b/src/com/android/settings/WirelessSettings.java
index 9567c01..b1b7e6e 100644
--- a/src/com/android/settings/WirelessSettings.java
+++ b/src/com/android/settings/WirelessSettings.java
@@ -148,7 +148,7 @@
         // Disable Tethering if it's not allowed or if it's a wifi-only device
         ConnectivityManager cm =
                 (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
-        if (!cm.isTetheringSupported() || Utils.isWifiOnly()) {
+        if (!cm.isTetheringSupported()) {
             getPreferenceScreen().removePreference(findPreference(KEY_TETHER_SETTINGS));
         } else {
             String[] usbRegexs = cm.getTetherableUsbRegexs();