remove unused UE_PF_PO and ue_pf_po_mutex

They use 4G NUMBER_OF_UE_MAX, which is not supposed to be present in 5G.
Further, the mutex and variable are global state; for Paging, we should
use F1.

executables/nr-uesoftmodem.c

@@ -567,9 +567,6 @@ int main(int argc, char **argv)
     }
 
     init_openair0();
-    // init UE_PF_PO and mutex lock
-    pthread_mutex_init(&ue_pf_po_mutex, NULL);
-    memset (&UE_PF_PO[0][0], 0, sizeof(UE_PF_PO_t)*NUMBER_OF_UE_MAX*MAX_NUM_CCs);
     set_latency_target();
 
     if(IS_SOFTMODEM_DOSCOPE_QT) {