Adding configuration file and was able to run both gNB and nrUE on b210 without any problem

* To run gNB : sudo ./nr-softmodem -E -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpb210.conf
* To run UE : sudo ./nr-uesoftmodem -E --numerology 1 -r 106 --phy-test -C 3510000000 --ue-rxgain 90 -d
* We had done a wired test with 40dB attenuator in between gNB and nrUE.

targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp

@@ -845,6 +845,10 @@ void set_rx_gain_offset(openair0_config_t *openair0_cfg, int chain_index,int bw_
 
   if (bw_gain_adjust==1) {
     switch ((int)openair0_cfg[0].sample_rate) {
+
+      case 46080000:
+        break;
+
       case 30720000:
         break;