gprs_bssgp: rename gprs_ns_config -> gprs_ns_update_config

Improve the naming of the function to match it's purpose.

Related: SYS#5354
Change-Id: Ib8e4ae734503fd6f6695d9d6767d809e1bf79d22
diff --git a/src/gprs_bssgp_pcu.c b/src/gprs_bssgp_pcu.c
index 7d793be..ce36c6b 100644
--- a/src/gprs_bssgp_pcu.c
+++ b/src/gprs_bssgp_pcu.c
@@ -1097,10 +1097,11 @@
 	return 0;
 }
 
-int gprs_ns_config(struct gprs_rlcmac_bts *bts, uint16_t nsei,
-		   const struct osmo_sockaddr *local,
-		   const struct osmo_sockaddr *remote,
-		   uint16_t *nsvci, uint16_t valid)
+/* update the ns configuration if needed */
+int gprs_ns_update_config(struct gprs_rlcmac_bts *bts, uint16_t nsei,
+			  const struct osmo_sockaddr *local,
+			  const struct osmo_sockaddr *remote,
+			  uint16_t *nsvci, uint16_t valid)
 {
 	int rc = 0;
 	if (!bts->nse) {