sgsn: Use the new NS2 api

The new NS2 api supports NSE with multiple NS-VC and contains a NS-VC
fsm. FR/GRE support is not working.
The configuration is compatible except for FR/GRE.

Relates: OS#4629
Depends-on: Iaad7b53d44338e5dd81dc2202f23bdcb715af804 (libosmocore)
Depends-on: I6cef42749555e577d5573f2ed8b8bce4cf842a98 (libosmocore)
Change-Id: I92a3bcaf166b091a22d74c7c1586964d33d7cc9d
diff --git a/src/sgsn/sgsn_vty.c b/src/sgsn/sgsn_vty.c
index fee328e..d7584bc 100644
--- a/src/sgsn/sgsn_vty.c
+++ b/src/sgsn/sgsn_vty.c
@@ -34,7 +34,7 @@
 
 #include <osmocom/sgsn/debug.h>
 #include <osmocom/sgsn/sgsn.h>
-#include <osmocom/gprs/gprs_ns.h>
+#include <osmocom/gprs/gprs_ns2.h>
 #include <osmocom/sgsn/gprs_gmm.h>
 #include <osmocom/sgsn/gprs_sgsn.h>
 #include <osmocom/sgsn/vty.h>