imx: ventana: config: add USB Mass Storage (ums) support

Add support for the USB mass storage gadget to enable access to on-board
storage.

Example:
 Ventana > ums 0 mmc 0 # provide ums access to the uSD
 Ventana > ums 0 usb 0 # provide ums access to the first USB device
 Ventana > ums 0 sata 0 # provide ums access to an mSATA device

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
1 file changed