drm/nouveau/nvkm: rip out old notify

drivers/gpu/drm/nouveau/include/nvif/event.h

drivers/gpu/drm/nouveau/include/nvif/ioctl.h

drivers/gpu/drm/nouveau/include/nvif/notify.h

drivers/gpu/drm/nouveau/include/nvkm/core/client.h

drivers/gpu/drm/nouveau/include/nvkm/core/event.h

drivers/gpu/drm/nouveau/include/nvkm/core/notify.h

drivers/gpu/drm/nouveau/nouveau_drv.h

drivers/gpu/drm/nouveau/nouveau_nvif.c

drivers/gpu/drm/nouveau/nouveau_usif.c

drivers/gpu/drm/nouveau/nvif/Kbuild

drivers/gpu/drm/nouveau/nvif/notify.c

drivers/gpu/drm/nouveau/nvkm/core/Kbuild

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

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

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

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

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

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

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

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