drm/i915: intel_runtime_pm.h does not actually need intel_display.h

Reduce includes.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/289a6837379c4422395c3ac2b36a6c2a44110227.1629281426.git.jani.nikula@intel.com

drivers/gpu/drm/i915/intel_runtime_pm.h

@@ -8,8 +8,6 @@
 
 #include <linux/types.h>
 
-#include "display/intel_display.h"
-
 #include "intel_wakeref.h"
 
 #include "i915_utils.h"