ci: reduce tx amplitude in zmq radio

OAI DFT has scaling issues when the signal is very strong or close to
full scale. So reduce amplitude by 10dB in gnb to prevent
overflow/clipping.
Signed-off-by: Sakthivel Velumani <s.velumani@northeastern.edu>

ci-scripts/yaml_files/5g_zmq_radio_1x1_ocudu/ocudu.yml

@@ -20,6 +20,8 @@ ru_sdr:
   srate: 23.04
   tx_gain: 25
   rx_gain: 25
+  amplitude_control:
+    tx_gain_backoff: 22
 
 cell_cfg:
   dl_arfcn: 632628

ci-scripts/yaml_files/5g_zmq_radio_2x2_ocudu/ocudu.yml

@@ -20,6 +20,8 @@ ru_sdr:
   srate: 61.44
   tx_gain: 25
   rx_gain: 25
+  amplitude_control:
+    tx_gain_backoff: 22
 
 cell_cfg:
   dl_arfcn: 632628