Change the device type from "usb_mass_storage" to "usb" when
booting a script.
Before this change:
=> printenv devtype
devtype=usb_mass_storage
After this change:
=> printenv devtype
devtype=usb
Signed-off-by: John Clark <inindev@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>