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/src/libbsc/bsc_init.c b/src/libbsc/bsc_init.c
index 2fb3842..34dfd36 100644
--- a/src/libbsc/bsc_init.c
+++ b/src/libbsc/bsc_init.c
@@ -529,10 +529,10 @@
 	return 0;
 }
 
-int bsc_network_alloc(mncc_recv_cb_t mncc_recv)
+int bsc_network_alloc(void)
 {
 	/* initialize our data structures */
-	bsc_gsmnet = bsc_network_init(tall_bsc_ctx, 1, 1, mncc_recv);
+	bsc_gsmnet = bsc_network_init(tall_bsc_ctx, 1, 1);
 	if (!bsc_gsmnet)
 		return -ENOMEM;