drm/nouveau: initial pass at moving to struct nvif_device

This is an attempt at isolating some of the changes necessary to port
to NVIF in a separate commit.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.h b/drivers/gpu/drm/nouveau/nouveau_chan.h
index 40f97e2..a3fec94 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.h
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.h
@@ -34,7 +34,7 @@
 	u32 user_get;
 	u32 user_put;
 
-	struct nouveau_object *object;
+	struct nvif_object *object;
 };