Cleanup of unused parallel/worker thread configuration in NR

* In LTE there is logic that checks the thread configurtion with the
  getters `get_thread_parallel_conf()` and `get_thread_worker_conf()`
  in NR these getters are not used, only setters, which have no impact

openair1/SIMULATION/NR_PHY/prachsim.c

@@ -58,8 +58,6 @@
 #define PRACH_WRITE_OUTPUT_DEBUG 1
 
 THREAD_STRUCT thread_struct;
-char *parallel_config = NULL;
-char *worker_config = NULL;
 
 char *uecap_file;
 PHY_VARS_gNB *gNB;