bts_osmotrx: Allow Setting Rx/TX paths through resources.conf

Change-Id: Iddb0f20366c3242098bdf869f39fc3e2244c13e7
diff --git a/example/resources.conf.prod b/example/resources.conf.prod
index 5b4185b..e5911f1 100644
--- a/example/resources.conf.prod
+++ b/example/resources.conf.prod
@@ -62,6 +62,8 @@
     trx_ip: 10.42.42.117
     clock_reference: external
     dev_args: "LimeSDR-USB,serial=00090706024F0A22"
+    channels:
+      - rx_path: "LNAW"
 
 - label: sysmoCell 5000
   type: osmo-bts-trx