drm/i915: drop intel_display.h include from intel_ddi.h

Use forward declarations instead.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211116171434.20516-1-jani.nikula@intel.com

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

@@ -6,11 +6,11 @@
 #ifndef __INTEL_DDI_H__
 #define __INTEL_DDI_H__
 
-#include "intel_display.h"
 #include "i915_reg.h"
 
 struct drm_connector_state;
 struct drm_i915_private;
+struct intel_atomic_state;
 struct intel_connector;
 struct intel_crtc;
 struct intel_crtc_state;
@@ -18,6 +18,8 @@ struct intel_dp;
 struct intel_dpll_hw_state;
 struct intel_encoder;
 struct intel_shared_dpll;
+enum pipe;
+enum port;
 enum transcoder;
 
 i915_reg_t dp_tp_ctl_reg(struct intel_encoder *encoder,