Adding Sierra AirCard support from OpenBSD

[M. Warner Losh]

In message: <20050227.210609.37239597.imp at bsdimp.com>
            "M. Warner Losh" <imp at bsdimp.com> writes:
: Looks like you have another serial port using 3f8-3ff (which is
: generally COM1).  I've had communications with insiders that say other
: serial ports would also work...  I've have no time to integrate
: things, however.

Also looks like all 4 traditional COM ports are supported, given the
highest config #....

Warner