USB: option: never bind to a usb-storage interface

There are many modems in addition to the D-Link DWM 652
exposing the CD interface in modem mode, and some expose
an integrated card reader as well. Always ignore these
interfaces.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>