Add enough register glue to make the thing read something that I think
is the hardware revision.

The stuff in iwl/ is going to eventually be a combination of what's
from the openbsd driver that I've been given, which was based on the
linux iwlwifi driver.  I'm also going to keep it formatted like
the linux driver, so i hopefully can do directory diffs and figure
out what I'm missing / doing wrong.
Start fleshing out the iwl config stuff from linux.

The openbsd driver port only handles the 7260 - and I'm not sure
if they handle all the variants. :(

So, I'm going to at least port over the config structures from
Linux iwlwifi so I don't have to worry about having differently
named things.
Bring over the config framework from the linux iwlwifi driver.

Include the 7xxx and 8xxx configuration bits.

This includes the configuration snippet I need to correctly
do the hardware revision identification - it requires knowledge
about whether the chip is an 8xxx series chip or not.