gprs_ns2: add new vty2

Change-Id: I163279cf57e84198dc8c53e1c109f5a9474670e9
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index 8f638ff..5c029b0 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -164,6 +164,7 @@
 gprs_ns2_sns_del_endpoint;
 gprs_ns2_vty_create;
 gprs_ns2_vty_init;
+gprs_ns2_vty2_init;
 
 gprs_nsvc_create2;
 gprs_nsvc_delete;