IOblix support changes

[Ignatios Souvatzis <is%netbsd.org@localhost>]

Hi,

I've added IOblix zbus support to the GENERIC configuration.

More important, I've made the IOblix serial master clock a patchable
kernel variable (iobzclock), in turn initialized by a kernel option
(IOBZCLOCK). The default is the 22118400 Hz used by newer boards, but
people with 24 MHz clocks will need to 

binpatch -s _iobzclock=24000000 /netbsd

or to build a kernel with

options IOBZCLOCK=24000000

and in both cases to reboot. 

If in doubt what your clock frequency is, look onto the board.

I'd also like reports about the parallel port. Does it work with NetBSD?

Regards,
        Ignatios