drm/nouveau/pwr: add some arith functions (mul32_32_64, subu64 and addu64)

Signed-off-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/arith.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/macros.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nv108.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nv108.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nva3.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nva3.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nvc0.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nvc0.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nvd0.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/nvd0.fuc.h
Simple merge