drm/nouveau/pmu: convert to new-style nvkm_subdev

drivers/gpu/drm/nouveau/include/nvkm/subdev/pmu.h

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

drivers/gpu/drm/nouveau/nvkm/engine/device/gf100.c

drivers/gpu/drm/nouveau/nvkm/engine/device/gk104.c

drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c

drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c

drivers/gpu/drm/nouveau/nvkm/engine/gr/gk104.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/Kbuild

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/gf119.fuc4

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/gf119.fuc4.h

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gf100.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gf119.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gk104.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gk110.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gk208.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gk20a.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm107.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gt215.c

drivers/gpu/drm/nouveau/nvkm/subdev/pmu/memx.c