When the ezusb code was split out, support was added for the fx2 chip
type, but no one is using these functions, so comment it out.  If
someone needs it, it can be added back in the future.

Also properly include <linux/usb/ezusb.h> into the ezusb.c file, to
ensure we catch any function prototype mis-matches
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Cc: René Bürgel <rene.buergel@sohard.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>