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

common/utils/telnetsrv/telnetsrv_enb_measurements.c

@@ -51,6 +51,8 @@
 #include "telnetsrv_cpumeasur_def.h"
 #include "openair2/LAYER2/MAC/mac.h"
 #include "openair1/PHY/phy_extern.h"
+#include "openair2/LAYER2/RLC/rlc.h"
+#include "openair2/LAYER2/PDCP_v10.1.0/pdcp.c"
 
 void measurcmd_display_macstats(telnet_printfunc_t prnt);
 void measurcmd_display_macstats_ue(telnet_printfunc_t prnt);

common/utils/telnetsrv/telnetsrv_enb_phycmd.c

@@ -38,6 +38,10 @@
 #include "telnetsrv.h"
 #define TELNETSRV_PHYCMD_MAIN
 #include "telnetsrv_phycmd.h"
+
+#include "PHY/defs_eNB.h"
+#include "LAYER2/MAC/mac_proto.h"
+
 char *prnbuff;
 extern int dump_eNB_stats(PHY_VARS_eNB *eNB, char *buffer, int length);