nvc0: regenerate rnndb headers

nvc0: regenerate rnndb headers

The headers hadn't been regenerated in a long time and had seen a number
of manual modifications. A few changes:
 - remove nvc0_2d entirely, use the nv50 header which has the nvc0
   values too
 - remove 3ddefs, it's identical to the nv50 file
 - move macros out into a separate file

Also the upstream rnndb changed the overall chip naming convention; this
was fixed up manually in the generated files until a better solution is
determined.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>