Cleanup of unused and outdated legacy RFSIM code

- deleted:    ../../../executables/rfsim.c
- removed unused command line options to set SINR and SNR
- removed unused functions to get SINR and SNR
- removed unused RFSIM struct members

executables/lte-softmodem.h

@@ -179,9 +179,6 @@ extern void init_UE(int nb_inst,
 
 extern void init_thread(int sched_runtime, int sched_deadline, int sched_fifo, cpu_set_t *cpuset, char *name);
 
-extern void init_ocm(void);
-extern void init_ue_devices(PHY_VARS_UE *);
-
 PHY_VARS_UE *init_ue_vars(LTE_DL_FRAME_PARMS *frame_parms, uint8_t UE_id, uint8_t abstraction_flag);
 
 void init_eNB_afterRU(void);