Remove dead code left over from NITB split

There still is a lot of dead code that we inherited from the NITB
days, let's remove more of it.

libtrau will be re-introduced as part of osmo-mgw later.

Change-Id: I8e0af56a158f25a4f1384d667c03eb20e72df5b8
diff --git a/tests/bssap/bssap_test.c b/tests/bssap/bssap_test.c
index 2b154c1..579cae2 100644
--- a/tests/bssap/bssap_test.c
+++ b/tests/bssap/bssap_test.c
@@ -82,7 +82,7 @@
 	struct gsm_network *net;
 	struct bsc_msc_data *msc;
 
-	net = bsc_network_init(NULL, 1, 1, NULL);
+	net = bsc_network_init(NULL, 1, 1);
 	net->bsc_data->rf_ctrl = talloc_zero(NULL, struct osmo_bsc_rf);
 	net->bsc_data->rf_ctrl->policy = S_RF_ON;