bsc: Prepare to have multiple MSC connections

We now have a list of MSCs but in the code we will
try to access the MSC with the nr 0.
diff --git a/openbsc/src/libcommon/gsm_data.c b/openbsc/src/libcommon/gsm_data.c
index a731c1a..6eb39b0 100644
--- a/openbsc/src/libcommon/gsm_data.c
+++ b/openbsc/src/libcommon/gsm_data.c
@@ -87,6 +87,7 @@
 
 	/* Init back pointer */
 	net->bsc_data->network = net;
+	INIT_LLIST_HEAD(&net->bsc_data->mscs);
 
 	net->country_code = country_code;
 	net->network_code = network_code;
@@ -141,14 +142,6 @@
 
 	net->mncc_recv = mncc_recv;
 
-	INIT_LLIST_HEAD(&net->bsc_data->msc.dests);
-	net->bsc_data->msc.ping_timeout = 20;
-	net->bsc_data->msc.pong_timeout = 5;
-	net->bsc_data->msc.core_ncc = -1;
-	net->bsc_data->msc.core_mcc = -1;
-	net->bsc_data->msc.rtp_base = 4000;
-	net->bsc_data->msc.network = net;
-
 	gsm_net_update_ctype(net);
 
 	return net;