Right now there's nothing, and kernel-doc produces a warning because
of that. Remove it until we need it for a clean build.

Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1468612088-9721-1-git-send-email-daniel.vetter@ffwll.ch