configs: am335x_boneblack_vboot: enable DM_USB and RNDIS boot in SPl

Enable DM_USB and DM_USB_GADGET for this platform. Also enable RNDIS boot
support (SPL load u-boot over USB RNDIS).
This is an example of how to use DM_USB on a am335x-based board.
A subsequent series will take this a step further and modify more
defconfigs.

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