drm/i915/bxt: Use intel_update_cdclk() to update dev_priv->cdclk_freq

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -5529,7 +5529,7 @@ static void broxton_set_cdclk(struct drm_device *dev, int frequency)
 		return;
 	}
 
-	dev_priv->cdclk_freq = frequency;
+	intel_update_cdclk(dev);
 }
 
 void broxton_init_cdclk(struct drm_device *dev)