drm/nouveau/pwr: implement a simple i2c stack

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/i2c_.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

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