drm/i915: split cdclk functions from display vtable.

This moves all the cdclk related functions into their own vtable.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/591b7b6a79c4ab644a161ae00b7d630b3ef16434.1632869550.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -373,7 +373,7 @@ struct intel_audio_funcs {
 				    const struct drm_connector_state *old_conn_state);
 };
 
-struct drm_i915_display_funcs {
+struct intel_cdclk_funcs {
 	void (*get_cdclk)(struct drm_i915_private *dev_priv,
 			  struct intel_cdclk_config *cdclk_config);
 	void (*set_cdclk)(struct drm_i915_private *dev_priv,
@@ -382,6 +382,9 @@ struct drm_i915_display_funcs {
 	int (*bw_calc_min_cdclk)(struct intel_atomic_state *state);
 	int (*modeset_calc_cdclk)(struct intel_cdclk_state *state);
 	u8 (*calc_voltage_level)(int cdclk);
+};
+
+struct drm_i915_display_funcs {
 	/* Returns the active state of the crtc, and if the crtc is active,
 	 * fills out the pipe-config with the hw state. */
 	bool (*get_pipe_config)(struct intel_crtc *,
@@ -984,6 +987,9 @@ struct drm_i915_private {
 	/* Display internal audio functions */
 	struct intel_audio_funcs audio_funcs;
 
+	/* Display CDCLK functions */
+	struct intel_cdclk_funcs cdclk_funcs;
+
 	/* PCH chipset type */
 	enum intel_pch pch_type;
 	unsigned short pch_id;