drm/nouveau/fifo: convert to new-style nvkm_engine

drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h

drivers/gpu/drm/nouveau/nvkm/core/gpuobj.c

drivers/gpu/drm/nouveau/nvkm/engine/ce/gt215.c

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/nv04.c

drivers/gpu/drm/nouveau/nvkm/engine/device/nv10.c

drivers/gpu/drm/nouveau/nvkm/engine/device/nv20.c

drivers/gpu/drm/nouveau/nvkm/engine/device/nv30.c

drivers/gpu/drm/nouveau/nvkm/engine/device/nv40.c

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

drivers/gpu/drm/nouveau/nvkm/engine/falcon.c

drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild

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

drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c

drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c