drm/i915/bxt: remove snooping workaround on old A revisions

No need to cater for old A revisions.
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487172099-24873-3-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_device_info.c

@@ -410,10 +410,6 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 
 	info->has_snoop = !info->has_llc;
 
-	/* Snooping is broken on BXT A stepping. */
-	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
-		info->has_snoop = false;
-
 	DRM_DEBUG_DRIVER("slice mask: %04x\n", info->sseu.slice_mask);
 	DRM_DEBUG_DRIVER("slice total: %u\n", hweight8(info->sseu.slice_mask));
 	DRM_DEBUG_DRIVER("subslice total: %u\n",