merge almost duplicated code for ru prach list and gNB prach list

(gNB is not the proper name, it is CU+DU, gNB is RU+CU+DU)

openair1/PHY/INIT/nr_init.c

@@ -192,7 +192,7 @@ void phy_init_nr_gNB(PHY_VARS_gNB *gNB)
   // PRACH
   prach_vars->rxsigF = (int16_t **)malloc16_clear(Prx * sizeof(int16_t *));
 
-  init_prach_list(gNB);
+  init_prach_list(&gNB->prach_vars.list, prach_upper);
 
   int N_RB_UL = cfg->carrier_config.ul_grid_size[cfg->ssb_config.scs_common.value].value;
   int n_buf = Prx*max_ul_mimo_layers;