drm/i915: Change vlv cdclk to use kHz units

Use kHz units in vlv cdclk code since that's more customary.

Also replace the precomputed 90% values with *9/10 computation
for extra clarity.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_i2c.c

@@ -86,7 +86,7 @@ static void gmbus_set_freq(struct drm_i915_private *dev_priv)
 
 	BUG_ON(!IS_VALLEYVIEW(dev_priv->dev));
 
-	vco = valleyview_get_vco(dev_priv);
+	vco = valleyview_get_vco(dev_priv) / 1000;
 
 	/* Get the CDCLK divide ratio */
 	cdclk_div = get_disp_clk_div(dev_priv, CDCLK);