Display carrier settings menu in GSM Phone if needs

Some carriers use their setting menu in CDMA. Furthermore, use in GSM
when roaming.
So change to show carrier settings menu in both CDMA and GSM Phone.

Bug: 11354773
Change-Id: Ifb329971df16351768fe14e6801cc83631e60971
diff --git a/res/xml/gsm_umts_options.xml b/res/xml/gsm_umts_options.xml
index df7f2d5..b2539a7 100644
--- a/res/xml/gsm_umts_options.xml
+++ b/res/xml/gsm_umts_options.xml
@@ -40,4 +40,12 @@
 
     </PreferenceScreen>
 
+    <PreferenceScreen
+        android:key="carrier_settings_key"
+        android:title="@string/carrier_settings_title">
+        <intent android:action="android.intent.action.MAIN"
+                android:targetPackage="@string/carrier_settings"
+                android:targetClass="@string/carrier_settings_menu" />
+    </PreferenceScreen>
+
 </PreferenceScreen>