drm/i915/display: reduce the includes in intel_dvo_dev.h

Only include what's needed.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/8523aa88daaf2dbf0ce138980142dbcd6d1ae0bc.1667383630.git.jani.nikula@intel.com

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

@@ -23,12 +23,12 @@
 #ifndef __INTEL_DVO_DEV_H__
 #define __INTEL_DVO_DEV_H__
 
-#include <linux/i2c.h>
-
-#include <drm/drm_crtc.h>
-
 #include "i915_reg_defs.h"
 
+enum drm_connector_status;
+struct drm_display_mode;
+struct i2c_adapter;
+
 struct intel_dvo_device {
 	const char *name;
 	int type;