Revert "drm/i915: Drop has_rc6 from device info"

This reverts commit 218076abbcd647de46635d21331a34b814f90906.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Acked-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220519090802.1294691-7-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index b220048..20de697 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -152,6 +152,7 @@ enum intel_ppgtt_type {
 	func(has_mslices); \
 	func(has_pooled_eu); \
 	func(has_pxp); \
+	func(has_rc6); \
 	func(has_rc6p); \
 	func(has_rps); \
 	func(has_runtime_pm); \