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/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
index 1bf8c7f..07e6c45 100644
--- a/include/osmocom/gprs/gprs_ns2.h
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -215,6 +215,8 @@
 					const struct osmo_sockaddr *remote,
 					struct gprs_ns2_nse *nse,
 					uint16_t nsvci);
+void gprs_ns2_ip_bind_set_sns_weight(struct gprs_ns2_vc_bind *bind,
+				     uint8_t signalling, uint8_t data);
 
 void gprs_ns2_free_bind(struct gprs_ns2_vc_bind *bind);
 void gprs_ns2_free_binds(struct gprs_ns2_inst *nsi);