vty: add port number for osmo-mgw

Change-Id: Ied224fe94b5152fd19e259396fbc0eaf69be4b96
diff --git a/include/osmocom/vty/ports.h b/include/osmocom/vty/ports.h
index ab3e1d5..ab43f05 100644
--- a/include/osmocom/vty/ports.h
+++ b/include/osmocom/vty/ports.h
@@ -28,4 +28,5 @@
 #define OSMO_VTY_PORT_HLR	4258
 /* 4259 used by control interface */
 #define OSMO_VTY_PORT_GGSN	4260
+#define OSMO_VTY_PORT_MGW	4261
 /* When adding/changing port numbers, keep docs and wiki in sync. See above. */