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>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 17070de..58846b5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5529,7 +5529,7 @@
 		return;
 	}
 
-	dev_priv->cdclk_freq = frequency;
+	intel_update_cdclk(dev);
 }
 
 void broxton_init_cdclk(struct drm_device *dev)