dm: usb: xhci: Use explicit parameters for xhci_alloc_virt_device()

This function should not be delving into struct usb_device. Pass in the
parameters it needs directly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 10f11cd..2ac5016 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -352,12 +352,10 @@
  * @param udev	pointer to USB deivce structure
  * @return 0 on success else -1 on failure
  */
-int xhci_alloc_virt_device(struct usb_device *udev)
+int xhci_alloc_virt_device(struct xhci_ctrl *ctrl, unsigned int slot_id)
 {
 	u64 byte_64 = 0;
-	unsigned int slot_id = udev->slot_id;
 	struct xhci_virt_device *virt_dev;
-	struct xhci_ctrl *ctrl = udev->controller;
 
 	/* Slot ID 0 is reserved */
 	if (ctrl->devs[slot_id]) {