RESTRICT AUTOMERGE Make VPN by Google One always appear in VPN settings

Bug: 233559781
Test: manually test
Change-Id: I175ab126ff92f773ab25a1fa64e4262b324fd353

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

@@ -42,4 +42,9 @@ public interface AdvancedVpnFeatureProvider {
      * Returns the title of vpn preference group.
      */
     String getVpnPreferenceGroupTitle(Context context);
+
+    /**
+     * Returns {@code true} advanced vpn is removable.
+     */
+    boolean isAdvancedVpnRemovable();
 }