vinco: Enable DM_USB and DM_SPI_FLASH support

As this platform already enables CONFIG_DM and CONFIG_OF_CONTROL,
migrating to DM_USB and DM_SPI_FLASH is just a matter of enabling the
correct options.

Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
u-boot@lists.denx.de (open list)
Reported-by: Marek Behun <marek.behun@nic.cz>
Signed-off-by: Tom Rini <trini@konsulko.com>