drm/xe/display: Add macro to get i915 device from xe_bo

Add helper macro to kill couple of #ifdefs
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_bo_types.h

@@ -78,4 +78,7 @@ struct xe_bo {
 	bool created;
 };
 
+#define intel_bo_to_drm_bo(bo) (&(bo)->ttm.base)
+#define intel_bo_to_i915(bo) to_i915(intel_bo_to_drm_bo(bo)->dev)
+
 #endif