mbms_create_tasks was calling SCTP task again.

This caused the SCTP descriptor to be reset. This
made issues in the X2 interface between gNB and eNB.
Lots of logs added here. Need to fill NR_UE_Capability_Info
properly.

targets/COMMON/create_tasks_mbms.c

@@ -52,6 +52,7 @@
 int create_tasks_mbms(uint32_t enb_nb) {
  // LOG_D(ENB_APP, "%s(enb_nb:%d\n", __FUNCTION__, enb_nb);
  // ngran_node_t type = RC.rrc[0]->node_type;
+  AssertFatal(!get_softmodem_params()->nsa, "In NSA mode\n");
   int rc;
 
   if (enb_nb == 0) return 0;