drm/nouveau/fifo/gv100: return work submission token in channel ctor args

The token will also contain runlist ID on Turing, so instead expose it as
an opaque value from NVKM so the client doesn't need to care.

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

drivers/gpu/drm/nouveau/nouveau_chan.h

@@ -11,6 +11,7 @@ struct nouveau_channel {
 
 	int chid;
 	u64 inst;
+	u32 token;
 
 	struct nvif_object vram;
 	struct nvif_object gart;