drm/nouveau/kms/gf119-: allow both 256- and 1024-sized LUTs to be used

The hardware supports either size. Also add checks to ensure that only
these two sizes may be used for supplying a LUT.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
14 files changed