[coreboot] [PATCH] FILO: USB_DISK by default should be disabled (trivial)

[Tadas Slotkus]

Hello,

This is my first patch, so please don't throw stones to me :)
"config USB_DISK" should somehow depend on libpayload's "config USB" at
least, but I don't know how to hardcode it, so I make USB disk to be
disabled, since USB is disabled by default. It would be great if you could
suggest how to link that dependency.