Add restricted padlock support for listpreference.

Change-Id: I1f3284a474d225df803abd57dd71382cb1dfa659
diff --git a/res/xml/security_settings_pattern.xml b/res/xml/security_settings_pattern.xml
index 867bed4..f8c4bd9 100644
--- a/res/xml/security_settings_pattern.xml
+++ b/res/xml/security_settings_pattern.xml
@@ -33,7 +33,7 @@
             android:key="visiblepattern"
             android:title="@string/lockpattern_settings_enable_visible_pattern_title"/>
 
-        <ListPreference
+        <com.android.settings.RestrictedListPreference
             android:key="lock_after_timeout"
             android:title="@string/lock_after_timeout"
             android:summary="@string/lock_after_timeout_summary"