gprs_ns2: add signalling & data weights for UDP binds

Allow to assign a signalling and data weight to UDP binds.
Those weights will be used when doing dynamic configuration over
IP-SNS.
This is only the first part which only uses the assigned weights
when doing a new SNS configuration.
The outgoing change weight procedure will be supported in a later patch
when the SNS fsm supports outgoing procedures.

Related: SYS#5354
Change-Id: I5133e4229377d44772a9af28628a2bc420fea34b
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index a3171d0..7da11cd 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -158,6 +158,7 @@
 gprs_ns2_ip_bind;
 gprs_ns2_ip_bind_by_sockaddr;
 gprs_ns2_ip_bind_set_dscp;
+gprs_ns2_ip_bind_set_sns_weight;
 gprs_ns2_ip_bind_sockaddr;
 gprs_ns2_ip_connect;
 gprs_ns2_ip_connect2;