drm/nouveau/volt: add support for GK20A

The voltage value are calculated by the hardware characterized
result.

Signed-off-by: Vince Hsu <vinceh@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/Makefile
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/device/nve0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/include/subdev/volt.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/os.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/clock/gk20a.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/volt/gk20a.c
Simple merge