hid: Add and detect a FIDO U2F HID group

This implements detection according to:

http://www.usb.org/developers/hidpage/HUTRR48.pdf

I haven't figured out the distinction between the parse and scan
stages, so I'm not sure I put the logic in the right place.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
2 files changed