uboot-imx

spl: net: dm: usb: bind the gadget before attempting to load the image

If DM_USB_GADGET is used, the usb ethernet gadget driver must be bound to a
controller before the image can be downloaded over the network.
In u-boot this can be done with the bind command. In SPL it must be done
programmatically.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>