drm/nv50-nvaf/fb: split the class definitions up a bit

These will diverge further in the future.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 8afec63..e8072f78 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -78,6 +78,10 @@
 nouveau-y += core/subdev/fb/nv49.o
 nouveau-y += core/subdev/fb/nv4e.o
 nouveau-y += core/subdev/fb/nv50.o
+nouveau-y += core/subdev/fb/nv84.o
+nouveau-y += core/subdev/fb/nva3.o
+nouveau-y += core/subdev/fb/nvaa.o
+nouveau-y += core/subdev/fb/nvaf.o
 nouveau-y += core/subdev/fb/nvc0.o
 nouveau-y += core/subdev/fb/ramnv04.o
 nouveau-y += core/subdev/fb/ramnv10.o