drm/nouveau/volt/gk20a: constify and name v_scale

Give a name to this constant so we at least get an idea of what it is
for.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2016-06-01 17:39:17 +09:00 • committed by Ben Skeggs
commit ff318a51bf