drm/nv31/mpeg: support for a single class3174 user

Uncertain if/how the hw does multiple PMPEG channels, supporting one is
better than none however.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index 93a2e83..07691c2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -633,7 +633,10 @@
 			break;
 		}
 
-		if (dev_priv->card_type == NV_40)
+		if (dev_priv->card_type == NV_40 ||
+		    dev_priv->chipset == 0x31 ||
+		    dev_priv->chipset == 0x34 ||
+		    dev_priv->chipset == 0x36)
 			nv31_mpeg_create(dev);
 		else
 		if (dev_priv->card_type == NV_50 &&