The onboard_usb_hub driver has been updated to support non-hub devices,
which has led to some renaming.

Update to the new name (ONBOARD_USB_DEV) accordingly.

Based on similar fixes done by Javier Carrasco for other defconfigs.

Fixes: 0bb36055 ("ARM: imx_v6_v7_defconfig: Select CONFIG_USB_ONBOARD_HUB")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>