resources.conf: Mark osmo-bts-trx as supporting a5/3

Change-Id: I478e0719589a8055e7b16536e679d2801efc5caf
diff --git a/example/resources.conf.rnd b/example/resources.conf.rnd
index 0fad50f..5358a61 100644
--- a/example/resources.conf.rnd
+++ b/example/resources.conf.rnd
@@ -33,7 +33,7 @@
     remote_user: jenkins
     trx_ip: 127.0.0.1
     dev_args: "type=b200,serial=30A9FFB"
-  ciphers: [a5_0, a5_1]
+  ciphers: [a5_0, a5_1, a5_3]
 
 - label: NanoBTS-ONW-1900
   type: nanobts