Use F1 internally: RRC Message Transfer

First MR in a series of changes to use the F1 interface internally at the gNB.

• RRC Reject not handled yet via F1 message exchange
• Removes ITTISIM (which does not compile)
• Refactors code duplication of linear allocator of gNB/eNB RRC

openair2/GNB_APP/gnb_config.c

@@ -758,8 +758,6 @@ void RCconfig_NR_L1(void) {
         LOG_I(PHY,"%s() NFAPI PNF mode - RC.nb_nr_CC[0]=%d for init_gNB_afterRU()\n", __FUNCTION__, RC.nb_nr_CC[0]);
         LOG_I(PHY,"%s() NFAPI PNF mode - RC.nb_nr_macrlc_inst:%d because used by mac_top_init_gNB()\n", __FUNCTION__, RC.nb_nr_macrlc_inst);
 
-        mac_top_init_gNB();
-
         configure_nr_nfapi_pnf(RC.gNB[j]->eth_params_n.remote_addr,
                                RC.gNB[j]->eth_params_n.remote_portc,
                                RC.gNB[j]->eth_params_n.my_addr,