Remove VpnType usage in VpnTransportInfo

The VpnType annotation is a hidden symbol, and should be
kept hidden as annotations are disallowed by API guidelines.

Remove its usage in VpnTransportInfo as users of annotated constants
that build against API stubs are expected not to use the annotation.

Bug: 173331190
Test: m
Change-Id: I171fa57f6279defad081c3cd16265d58ec55e57d

framework/src/android/net/VpnTransportInfo.java

@@ -42,9 +42,9 @@ public final class VpnTransportInfo implements TransportInfo, Parcelable {
             MessageUtils.findMessageNames(new Class[]{VpnManager.class}, new String[]{"TYPE_VPN_"});
 
     /** Type of this VPN. */
-    @VpnManager.VpnType public final int type;
+    public final int type;
 
-    public VpnTransportInfo(@VpnManager.VpnType int type) {
+    public VpnTransportInfo(int type) {
         this.type = type;
     }