am33xx: board: init usb ether gadget for rndis support
Add usb ether gadget device with usb_ether_init() when
CONFIG_DM_ETH and CONFIG_USB_ETHER are defined.
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>