This can now load the firmware and initialise the modem for itself,
with no need for any userspace help (except for putting the firmware
in /lib/firmware in the first place). 

The core packet I/O code is split out into a separate file where it can
be used by drivers for some of the other similar modems.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>