include/drm-uapi: clarify when headers can be updated.

Clarify when headers can be updated here.

Reviewed-by: Gurchetan Singh<gurchetansingh@chromium.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed