drm/i915: drop intel_display.h include from intel_dpll_mgr.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/20211116171434.20516-2-jani.nikula@intel.com

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

@@ -27,7 +27,6 @@
 
 #include <linux/types.h>
 
-#include "intel_display.h"
 #include "intel_wakeref.h"
 
 /*FIXME: Move this to a more appropriate place. */
@@ -37,6 +36,7 @@
 	(void) (&__a == &__b);			\
 	__a > __b ? (__a - __b) : (__b - __a); })
 
+enum tc_port;
 struct drm_device;
 struct drm_i915_private;
 struct intel_atomic_state;