We don't need i915_gem_object_flush_if_display on Xe side. Add empty
define to tackle compilation errors with display code where it's used.
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>