nvc0: don't bother trying to set up compute for gk110+
The nouveau fw currently prints a bunch of errors. No point in seeing those all the time, esp since compute doesn't really work in the first place. Signed-off-by:Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by:
Ben Skeggs <bskeggs@redhat.com> Cc: "10.2" <mesa-stable@lists.freedesktop.org>