I'm not 100% sure that the nv94 one we were using won't work. The context
layouts are identical (well.. same ctxprog, so of course!), only a couple
of registers differ. But, be safe until we actually get some 9xxx chips
working.
I either messed up when I pulled these from a mmio-trace last time, or
the previous values didn't work on my card. Hopefully it's the former!
In any case, at least one of the original NV50 chipsets work now.
This turns the various nvXX_graph_init_ctxvals() methods into tables,
and speeds up compliation of nv50_graph.c quite a bit. This has bothered
me for a while, but others are complaining now so it's time to fix it :)