drm/i915/display: Include of display limits doesn't need 'display/'

Drop the unnecessary directory prefix.  This also makes
intel_display_device.h easier to use from the Xe driver.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230607150946.1996087-1-matthew.d.roper@intel.com

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

@@ -8,7 +8,7 @@
 
 #include <linux/types.h>
 
-#include "display/intel_display_limits.h"
+#include "intel_display_limits.h"
 
 struct drm_i915_private;