drm/nouveau/bar: tidy up the subdev and object class definitions

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

diff --cc drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/include/subdev/bar.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/bar/base.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/bar/nv50.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/bar/nvc0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/bar/priv.h
Simple merge