default-suites.conf: Run 4g test suite (srsLTE ZeroMQ)

Change-Id: I3f8c3588d7b139f044462d02069919256126bf57
diff --git a/example/default-suites.conf b/example/default-suites.conf
index a0dabdd..cfac1ca 100644
--- a/example/default-suites.conf
+++ b/example/default-suites.conf
@@ -161,3 +161,5 @@
 - nitb_smpp
 - smpp
 - encryption
+
+- 4g