nr rlc: first commit

Initial implementation.

nr_rlc/nr_rlc_oai_api.c will need some clean rewrite at some point.

More testing is also needed.

executables/nr-softmodem.c

@@ -924,6 +924,10 @@ init_opt();
 #  define PACKAGE_VERSION "UNKNOWN-EXPERIMENTAL"
 #endif
   LOG_I(HW, "Version: %s\n", PACKAGE_VERSION);
+
+  if(IS_SOFTMODEM_NOS1)
+	  init_pdcp();
+
 #if defined(ENABLE_ITTI)
 
   if (RC.nb_nr_inst > 0)  {
@@ -942,9 +946,6 @@ init_opt();
     flexran_agent_start(i);
   }
 
-  if(IS_SOFTMODEM_NOS1)
-	  init_pdcp();
-
   // init UE_PF_PO and mutex lock
   pthread_mutex_init(&ue_pf_po_mutex, NULL);
   memset (&UE_PF_PO[0][0], 0, sizeof(UE_PF_PO_t)*NUMBER_OF_UE_MAX*MAX_NUM_CCs);