Disable change PIN when PIN is inactive

Disabled the option to change PIN code when PIN lock is disabled.
This is done by adding dependency to the checkbox above in the XML file.

Change-Id: Idafae0820297b8f7ba7a14f5ebe4f7e691547cc8

res/xml/sim_lock_settings.xml

@@ -25,6 +25,7 @@
             android:summaryOff="@string/sim_lock_off"/>
     <com.android.settings.EditPinPreference
             android:key="sim_pin"
+            android:dependency="sim_toggle"
             android:title="@string/sim_pin_change"
             android:dialogTitle="@string/sim_change_pin"
             android:dialogMessage="@string/sim_enter_old"