drm/nouveau/nvif: split out nvsw interface definitons

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/include/nvif/if0005.h b/drivers/gpu/drm/nouveau/include/nvif/if0005.h
new file mode 100644
index 0000000..abfd373
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/include/nvif/if0005.h
@@ -0,0 +1,4 @@
+#ifndef __NVIF_IF0005_H__
+#define __NVIF_IF0005_H__
+#define NV10_NVSW_NTFY_UEVENT                                              0x00
+#endif