drm/i915: Remove unused for_each_uabi_class_engine

Unused macro after 99919be7 ("drm/i915/gem: Zap the i915_gem_object_blt code")
removed some code.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231102093248.362659-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -403,11 +403,6 @@ static inline struct intel_gt *to_gt(const struct drm_i915_private *i915)
 	     (engine__); \
 	     (engine__) = rb_to_uabi_engine(rb_next(&(engine__)->uabi_node)))
 
-#define for_each_uabi_class_engine(engine__, class__, i915__) \
-	for ((engine__) = intel_engine_lookup_user((i915__), (class__), 0); \
-	     (engine__) && (engine__)->uabi_class == (class__); \
-	     (engine__) = rb_to_uabi_engine(rb_next(&(engine__)->uabi_node)))
-
 #define INTEL_INFO(i915)	((i915)->__info)
 #define RUNTIME_INFO(i915)	(&(i915)->__runtime)
 #define DRIVER_CAPS(i915)	(&(i915)->caps)