drm/radeon: drop unused ati pcigart include.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_drv.h

@@ -35,7 +35,6 @@
 #include <linux/platform_device.h>
 #include <drm/drm_legacy.h>
 
-#include <drm/ati_pcigart.h>
 #include "radeon_family.h"
 
 /* General customization: