drm/i915/display: accept either i915 or display for feature tests

Use the generic __to_intel_display() to allow passing either struct
drm_i915_private * or struct intel_display * to the feature test macros.
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/bed78da39e6bd1587db4dab820602c55c63cdd6a.1713358679.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_display_device.h

@@ -8,6 +8,7 @@
 
 #include <linux/types.h>
 
+#include "intel_display_conversion.h"
 #include "intel_display_limits.h"
 
 struct drm_i915_private;
@@ -100,8 +101,8 @@ struct drm_printer;
 	(IS_DISPLAY_IP_RANGE((__i915), (ipver), (ipver)) && \
 	 IS_DISPLAY_STEP((__i915), (from), (until)))
 
-#define DISPLAY_INFO(i915)		((i915)->display.info.__device_info)
-#define DISPLAY_RUNTIME_INFO(i915)	(&(i915)->display.info.__runtime_info)
+#define DISPLAY_INFO(i915)		(__to_intel_display(i915)->info.__device_info)
+#define DISPLAY_RUNTIME_INFO(i915)	(&__to_intel_display(i915)->info.__runtime_info)
 
 #define DISPLAY_VER(i915)	(DISPLAY_RUNTIME_INFO(i915)->ip.ver)
 #define DISPLAY_VER_FULL(i915)	IP_VER(DISPLAY_RUNTIME_INFO(i915)->ip.ver, \