libmsc: properly name the MSC_CONN_USE token for SS

Previously the MSC_CONN_USE token for Supplementary Services was
called 'MSC_CONN_USE_TRANS_USSD'. Non-call related Supplementary
Services is not only about USSD, so let's rename it.

Change-Id: I5b3517c87a32fa64dea6b0c912f2b76c5c25a112
diff --git a/include/osmocom/msc/osmo_msc.h b/include/osmocom/msc/osmo_msc.h
index 632b231..995b195 100644
--- a/include/osmocom/msc/osmo_msc.h
+++ b/include/osmocom/msc/osmo_msc.h
@@ -91,7 +91,7 @@
 	MSC_CONN_USE_CM_SERVICE,
 	MSC_CONN_USE_TRANS_CC,
 	MSC_CONN_USE_TRANS_SMS,
-	MSC_CONN_USE_TRANS_USSD,
+	MSC_CONN_USE_TRANS_NC_SS,
 	MSC_CONN_USE_SILENT_CALL,
 	MSC_CONN_USE_RELEASE,
 };
diff --git a/src/libmsc/osmo_msc.c b/src/libmsc/osmo_msc.c
index 02c335c..62a449f 100644
--- a/src/libmsc/osmo_msc.c
+++ b/src/libmsc/osmo_msc.c
@@ -327,7 +327,7 @@
 	{MSC_CONN_USE_CM_SERVICE,	"cm_service"},
 	{MSC_CONN_USE_TRANS_CC,		"trans_cc"},
 	{MSC_CONN_USE_TRANS_SMS,	"trans_sms"},
-	{MSC_CONN_USE_TRANS_USSD,	"trans_ussd"},
+	{MSC_CONN_USE_TRANS_NC_SS,	"trans_nc_ss"},
 	{MSC_CONN_USE_SILENT_CALL,	"silent_call"},
 	{MSC_CONN_USE_RELEASE,		"release"},
 	{0, NULL},