va: flush_resource before presentation

drivers require this to ensure presentation resources are present-able

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30984>

src/gallium/frontends/va/surface.c

@@ -540,6 +540,8 @@ vlVaPutSurface(VADriverContextP ctx, VASurfaceID surface_id, void* draw, short s
       return status;
    }
 
+   drv->pipe->flush_resource(drv->pipe, tex);
+
    /* flush before calling flush_frontbuffer so that rendering is flushed
     * to back buffer so the texture can be copied in flush_frontbuffer
     */