usb: gadget: mv_u3d_core: remove unused clock

The origianl understanding of clock is wrong. The UDC controller
only have one clock input.
Passing clock name by pdata is wrong. The clock is defined by device
iteself.

Cc: Chao Xie <chao.xie@marvell.com>
Cc: Yu Xu <yuxu@marvell.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/mv_u3d_core.c

@@ -1821,7 +1821,7 @@ static int mv_u3d_probe(struct platform_device *dev)
 	u3d->dev = &dev->dev;
 	u3d->vbus = pdata->vbus;
 
-	u3d->clk = clk_get(&dev->dev, pdata->clkname[0]);
+	u3d->clk = clk_get(&dev->dev, NULL);
 	if (IS_ERR(u3d->clk)) {
 		retval = PTR_ERR(u3d->clk);
 		goto err_get_clk;