phy: cpcap-usb: Remove some useless code

Axe a clk that is unused in the driver.

Signed-off-by: Christophe JAILLET <[e-mail]>
Acked-by: Tony Lindgren <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/motorola/phy-cpcap-usb.c

···
 struct cpcap_phy_ddata {
 	struct regmap *reg;
 	struct device *dev;
-	struct clk *refclk;
 	struct usb_phy phy;
 	struct delayed_work detect_work;
 	struct pinctrl *pins;
···
 
 	usb_remove_phy(&ddata->phy);
 	cancel_delayed_work_sync(&ddata->detect_work);
-	clk_unprepare(ddata->refclk);
 	regulator_disable(ddata->vusb);
 
 	return 0;