drm/i915: Drop duplicate WaDisable4x2SubspanOptimization:hsw

Same workaround was listed two times - once under the Gen7 block and once
under the Haswell section.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210507084926.2423003-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/gt/intel_workarounds.c

@@ -1859,9 +1859,6 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 			      CACHE_MODE_0_GEN7,
 			      /* enable HiZ Raw Stall Optimization */
 			      HIZ_RAW_STALL_OPT_DISABLE);
-
-		/* WaDisable4x2SubspanOptimization:hsw */
-		wa_masked_en(wal, CACHE_MODE_1, PIXEL_SUBSPAN_COLLECT_OPT_DISABLE);
 	}
 
 	if (IS_VALLEYVIEW(i915)) {