srsue, amarisoft/srsENB: Support setting rx/tx_gain attributes

Change-Id: I4228ba8746a54db4c17443718c01069d431361b9
diff --git a/src/osmo_gsm_tester/templates/srsue.conf.tmpl b/src/osmo_gsm_tester/templates/srsue.conf.tmpl
index 37175dd..a600f5e 100644
--- a/src/osmo_gsm_tester/templates/srsue.conf.tmpl
+++ b/src/osmo_gsm_tester/templates/srsue.conf.tmpl
@@ -37,8 +37,8 @@
 dl_earfcn = 2850
 % endif
 freq_offset = 0
-tx_gain = 80
-#rx_gain = 40
+tx_gain = ${ue.tx_gain}
+rx_gain = ${ue.rx_gain}
 
 #nof_radios = 1
 nof_antennas = ${ue.num_antennas}