added nr_scg_ssb_freq param in enb conf file used by CI

ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf

@@ -144,6 +144,8 @@ eNBs =
       discRxPool_ResourceConfig_subframeBitmap_choice_bs_size         = 5;
       discRxPool_ResourceConfig_subframeBitmap_choice_bs_bits_unused  = 0;
 
+      //SSB central frequency of NR secondary cell group (for ENDC NSA)
+      nr_scg_ssb_freq = 641272;
     }
   );