add support for the nokia 6680 with a ca-42 cable.
add support for the nokia 6680 with a ca-42 cable.

When looping over all the descriptors to fund functional
descriptors for CM, ACM, and UNION, I make sure to only look for
these descriptors in the interface number we are using.  At least
on the 6680, there are lots of interfaces, and more than one of
them have UNION and ACM functional descriptors.  Only the ones at
the CDC/ACM/AT interface are the ones to use...

diff from Staffan Ulberg, on top of a diff from Tony Lambiris

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars