fix 20 MHz config file

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.100PRB.usrpx310.conf

@@ -22,6 +22,9 @@ eNBs =
 
     component_carriers = (
       {
+        node_function                                         = "eNodeB_3GPP";
+        node_timing                                           = "synch_to_ext_device";
+        node_synch_ref                                        = 0;
         frame_type					      = "FDD";
         tdd_config 					      = 3;
         tdd_config_s            			      = 0;