Add help url placeholder for SimLock settings

Bug: 38412798
Test: manual
Change-Id: I77a8fa89c2b16da9269b40c5efcb6d0f868d5b76

res/values/strings.xml

@@ -6233,6 +6233,7 @@
     <string name="help_url_system_dashboard" translatable="false"></string>
     <string name="help_url_double_tap_screen" translatable="false"></string>
     <string name="help_url_account_detail" translatable="false"></string>
+    <string name="help_url_icc_lock" translatable="false"></string>
 
     <!-- User account title [CHAR LIMIT=30] -->
     <string name="user_account_title">Account for content</string>

src/com/android/settings/IccLockSettings.java

@@ -287,6 +287,11 @@ public class IccLockSettings extends SettingsPreferenceFragment
         getContext().unregisterReceiver(mSimStateReceiver);
     }
 
+    @Override
+    protected int getHelpResource() {
+        return R.string.help_url_icc_lock;
+    }
+
     @Override
     public void onSaveInstanceState(Bundle out) {
         // Need to store this state for slider open/close