drm: Remove IS_IRONLAKE_D()

This define hasn't been used since:

  commit cfdf1fa23f4074c9f8766dc67a928bbf680b1ac9
  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>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 29cccf3..9bf2801 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1505,7 +1505,6 @@
 #define IS_PINEVIEW_M(dev)	((dev)->pci_device == 0xa011)
 #define IS_PINEVIEW(dev)	(INTEL_INFO(dev)->is_pineview)
 #define IS_G33(dev)		(INTEL_INFO(dev)->is_g33)
-#define IS_IRONLAKE_D(dev)	((dev)->pci_device == 0x0042)
 #define IS_IRONLAKE_M(dev)	((dev)->pci_device == 0x0046)
 #define IS_IVYBRIDGE(dev)	(INTEL_INFO(dev)->is_ivybridge)
 #define IS_IVB_GT1(dev)		((dev)->pci_device == 0x0156 || \