drm/msm/dpu: Remove unused macro

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h

@@ -139,10 +139,6 @@ struct vsync_info {
 
 #define to_dpu_kms(x) container_of(x, struct dpu_kms, base)
 
-/* get struct msm_kms * from drm_device * */
-#define ddev_to_msm_kms(D) ((D) && (D)->dev_private ? \
-		((struct msm_drm_private *)((D)->dev_private))->kms : NULL)
-
 /**
  * Debugfs functions - extra helper functions for debugfs support
  *