Hide lockdown VPN when IMS auth is required.

Bug: 7069782
Change-Id: I978d89894da17164a1e0122adb5acbfda3586fa1

src/com/android/settings/vpn2/VpnSettings.java

@@ -28,6 +28,7 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.os.ServiceManager;
+import android.os.SystemProperties;
 import android.preference.Preference;
 import android.preference.PreferenceGroup;
 import android.security.Credentials;
@@ -104,6 +105,16 @@ public class VpnSettings extends SettingsPreferenceFragment implements
         inflater.inflate(R.menu.vpn, menu);
     }
 
+    @Override
+    public void onPrepareOptionsMenu(Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+
+        // Hide lockdown VPN on devices that require IMS authentication
+        if (SystemProperties.getBoolean("persist.radio.imsregrequired", false)) {
+            menu.findItem(R.id.vpn_lockdown).setVisible(false);
+        }
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {