ttcn3: Enable tests against O2CG

Change-Id: Ie42f9144c6fa5cbee71e3f0b97d60c295f5f531e
diff --git a/ttcn3/default-suites.conf b/ttcn3/default-suites.conf
index cfa46b4..14d2b35 100644
--- a/ttcn3/default-suites.conf
+++ b/ttcn3/default-suites.conf
@@ -1,2 +1,3 @@
 - ttcn3_bts_tests:trx
 - ttcn3_bts_tests:sysmo
+- ttcn3_bts_tests:oc2g