drm/xe/display: remove the unused compat HAS_GMD_ID()

The display code no longer needs or uses HAS_GMD_ID(). Remove it from
the compat header.
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/67571bb0b10fb5c99dba57757f2213ef39bdedbb.1724180287.git.jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h

@@ -80,8 +80,6 @@ static inline struct drm_i915_private *kdev_to_i915(struct device *kdev)
 
 #define IS_MOBILE(xe) (xe && 0)
 
-#define HAS_GMD_ID(xe) GRAPHICS_VERx100(xe) >= 1270
-
 #define INTEL_DISPLAY_STEP(xe) ((xe)->info.step.display)
 
 /* Workarounds not handled yet */