drm/i915: remove unused HAS_BROKEN_CS_TLB()

The last users have been removed years ago. Finish the job.
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240731110744.1572240-1-jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -678,9 +678,6 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 	((sizes) & ~RUNTIME_INFO(i915)->page_sizes) == 0; \
 })
 
-/* Early gen2 have a totally busted CS tlb and require pinned batches. */
-#define HAS_BROKEN_CS_TLB(i915)	(IS_I830(i915) || IS_I845G(i915))
-
 #define NEEDS_RC6_CTX_CORRUPTION_WA(i915)	\
 	(IS_BROADWELL(i915) || GRAPHICS_VER(i915) == 9)