CI: increase tested bitrate for 100 MHz scenario in SA-2x2

Modify the UL/DL UDP iperf test cases to use a higher requested bitrate
for the scenario with 100 MHz bandwidth in the SA-2x2 pipeline. Adjust
gNB config file to allow for higher UL throughput.

ci-scripts/conf_files/gnb.sa.band77.273prb.usrpn310.2x2.conf

@@ -23,7 +23,6 @@ gNBs = (
   pusch_AntennaPorts    = 2;
   do_CSIRS              = 1;
   do_SRS                = 1;
-  ul_prbblacklist       = "135,136,137,138"
 
   servingCellConfigCommon = (
   {
@@ -177,8 +176,8 @@ MACRLCs = (
   num_cc                      = 1;
   tr_s_preference             = "local_L1";
   tr_n_preference             = "local_RRC";
-  pusch_TargetSNRx10          = 200;
-  pucch_TargetSNRx10          = 200;
+  pusch_TargetSNRx10          = 270;
+  pucch_TargetSNRx10          = 270;
   pusch_FailureThres          = 1000;
   ulsch_max_frame_inactivity  = 0;
   ul_max_mcs                  = 25;
@@ -200,11 +199,11 @@ RUs = (
   local_rf       = "yes"
   nb_tx          = 2;
   nb_rx          = 2;
-  att_tx         = 12;
+  att_tx         = 15;
   att_rx         = 0;
   bands          = [77];
   max_pdschReferenceSignalPower = -27;
-  max_rxgain                    = 72;
+  max_rxgain                    = 71;
   eNB_instances  = [0];
   ##beamforming 1x2 matrix: 1 layer x 2 antennas
   bf_weights = [0x00007fff, 0x0000];