drm/i915/fdi: hide struct intel_fdi_funcs

The struct is only needed in intel_fdi.c, move it there.
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/a6c524a9abb74be9b4d6a084de5461404b823a10.1643896905.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_fdi.c

@@ -10,6 +10,11 @@
 #include "intel_display_types.h"
 #include "intel_fdi.h"
 
+struct intel_fdi_funcs {
+	void (*fdi_link_train)(struct intel_crtc *crtc,
+			       const struct intel_crtc_state *crtc_state);
+};
+
 static void assert_fdi_tx(struct drm_i915_private *dev_priv,
 			  enum pipe pipe, bool state)
 {

drivers/gpu/drm/i915/i915_drv.h

@@ -121,6 +121,7 @@ struct intel_crtc;
 struct intel_dp;
 struct intel_encoder;
 struct intel_fbdev;
+struct intel_fdi_funcs;
 struct intel_hotplug_funcs;
 struct intel_initial_plane_config;
 struct intel_limit;
@@ -322,11 +323,6 @@ struct drm_i915_wm_disp_funcs {
 	int (*compute_global_watermarks)(struct intel_atomic_state *state);
 };
 
-struct intel_fdi_funcs {
-	void (*fdi_link_train)(struct intel_crtc *crtc,
-			       const struct intel_crtc_state *crtc_state);
-};
-
 struct intel_dpll_funcs {
 	int (*crtc_compute_clock)(struct intel_crtc_state *crtc_state);
 };