initial silicon image sil164 test code..

[Dave Airlie]

Okay in the 'sil164-support' branch of my personal xf86-video-ati git
tree on fd.o, I've just added support for detecting the sil164 chip
and turning its power on/off.

I get some crap on my second TMDS head with this but it isn't
correct... I suspect I need to write some more data to the sil chip...
(on Intel I didn't have to do much except turn it on...)

Dave.