libvrflinger: Remove superfluous update to display manager.

Setting visibility attributes already triggers an update to the
display manager. Avoid the double trigger.

Bug: None
Test: build; run
Change-Id: I4c8a7c814143ccd1a4fc22fe068ba9b05d95cdd6
diff --git a/libs/vr/libvrflinger/display_service.cpp b/libs/vr/libvrflinger/display_service.cpp
index 7706799..2f54f71 100644
--- a/libs/vr/libvrflinger/display_service.cpp
+++ b/libs/vr/libvrflinger/display_service.cpp
@@ -116,8 +116,6 @@
     surface->OnSetAttributes(message,
                              {{display::SurfaceAttribute::Visible,
                                display::SurfaceAttributeValue{false}}});
-    SurfaceUpdated(surface->surface_type(),
-                   display::SurfaceUpdateFlags::VisibilityChanged);
   }
 }