amarisoft_ue: fix UHD support

the Amarisoft UE seems to be only working with UHD when the bandwidth
param is provided. It seems the set_bandwidth() API is used.

Change-Id: I3f20a5a8ca80c63374f0ad500fd2794e2dc45479
diff --git a/src/osmo_gsm_tester/templates/amarisoft_lteue.cfg.tmpl b/src/osmo_gsm_tester/templates/amarisoft_lteue.cfg.tmpl
index 4831278..59ab8b2 100644
--- a/src/osmo_gsm_tester/templates/amarisoft_lteue.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/amarisoft_lteue.cfg.tmpl
@@ -13,6 +13,8 @@
 % if ue.rf_dev_type == 'zmq':
   /* Force sampling rate (if uncommented) */
   sample_rate: ${ue.sample_rate},
+% else:
+  bandwidth: ${ue.bandwidth},
 %endif
 
 //  log_options: "all.level=debug,all.max_size=32",