[coreboot] [PATCH]Remove old USB driver from FILO

[Patrick Georgi]

Hi,

attached patch removes the old USB driver from FILO and renames the "usb
new" driver to just usb (so we don't end up with awkward situations in
the future like with our old 'newconfig').

Given that the usb driver is only one file, I also dropped the
drivers/usb/ directory.

Signed-off-by: Patrick Georgi