[PATCH] Add tdfx palette hack to offb driver

Hi All

Attached is a patch (against 2.4.20) which adds a palette hack for Voodoo3/4/5 
cards to the offb driver. It's tested and working here on a Voodoo3 and a 
Voodoo4. I'd welcome comments, though. Particularly, I think the probing for 
a Voodoo card may be a bit shaky. Basically I'm match the OF name with the 
pattern "3Dfx,Voodoo*". This may cause problems if there are Voodoo1 or 2 
cards available with OF drivers, and so need tightening up.

Cheers,
Rich