RC: forward declarations and link physims better

The simulators have been changed: due to linker errors that would arise
otherwise, a lot of functions are defined in them to avoid such errors.
Some functions are also defined in header files; in this commit, we
define most functoins in nr_dummy_functions.c, which is compiled in, not
by including the C file, but by adding it to the target in
CMakeLists.txt

- nr_dlsim+nr_ulsim need NR_IF_Module_init(), so it cannot be in
  nr_dummy_functions, but the others need it
- Link correcr NR_IF_Module_init() into these simulators, and reduce
  overall link list
- Correctly link remaining simulators

openair1/SCHED/fapi_l1.c

@@ -1014,7 +1014,7 @@ void schedule_response(Sched_Rsp_t *Sched_INFO, void *arg) {
         UL_req->ul_config_request_body.number_of_pdus=0;
         number_ul_pdu=0;
       }else if (RC.mac[Mod_id]->scheduler_mode == SCHED_MODE_FAIR_RR) {
-        if(ulsch_pdu_num <= RC.rrc[Mod_id]->configuration.radioresourceconfig[CC_id].ue_multiple_max){
+        if(ulsch_pdu_num <= fp->ue_multiple_max){
           UL_req->sfn_sf = frame << 4 | subframe;
           oai_nfapi_ul_config_req(UL_req);
           UL_req->ul_config_request_body.number_of_pdus=0;