CG12 support

[Michael <macallan%netbsd.org@localhost>]

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Hello,

now that I have the hardware I had to make it work ;)
So, there's cgtwelve at sbus which supports the usual wsdisplay stuff  
but no acceleration so far and the console runs in monochrome since  
that's what the firmware uses and it's faster than 8 bit. Letting the  
console run in 8bit colour would be trivial though.
X in 24 bit colour with wsfb should Just Work without any need to  
update anything ( well, except the kernel to get the cgtwelve driver )

have fun
Michael

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