This define hasn't been used since:
commit cfdf1fa23f
Author: Kristian Høgsberg <krh@bitplanet.net>
Date: Wed Dec 16 15:16:16 2009 -0500
drm/i915: Implement IS_* macros using static tables
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>