Return legacy VPN info regardless of lockdown mode

This stops Settings from telling the user detailed information, and
doesn't really protect anything secret -- privileged apps can already
tell that there's an active VPN by looking at network info.

Change-Id: I9c2a3cab6dff1b62e94a9e0735dccde226fd26a3
Fix: 28624328

services/core/java/com/android/server/ConnectivityService.java

@@ -3229,9 +3229,6 @@ public class ConnectivityService extends IConnectivityManager.Stub
     @Override
     public LegacyVpnInfo getLegacyVpnInfo(int userId) {
         enforceCrossUserPermission(userId);
-        if (mLockdownEnabled) {
-            return null;
-        }
 
         synchronized(mVpns) {
             return mVpns.get(userId).getLegacyVpnInfo();