usb: gadget: fusb300_udc: don't assign gadget.dev.release directly

udc-core provides a better way to handle release
methods, let's use it.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/fusb300_udc.c

@@ -1418,7 +1418,6 @@ static int __init fusb300_probe(struct platform_device *pdev)
 	fusb300->gadget.ops = &fusb300_gadget_ops;
 
 	fusb300->gadget.max_speed = USB_SPEED_HIGH;
-	fusb300->gadget.dev.release = pdev->dev.release;
 	fusb300->gadget.name = udc_name;
 	fusb300->reg = reg;