bsc: Hand the msc_connection to the UDT handling, pass it to paging

Pass the osmo_msc_data to the paging sub system, change the code
to pass the osmo_msc_data instead of network + bsc_msc_conn.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_sccp.c b/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
index 6b7256b..37eb1b7 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
@@ -161,7 +161,7 @@
 static int msc_sccp_read(struct msgb *msgb, unsigned int length, void *data)
 {
 	struct osmo_msc_data *msc = (struct osmo_msc_data *) msgb->cb[0];
-	return bsc_handle_udt(msc->network, msc->msc_con, msgb, length);
+	return bsc_handle_udt(msc, msgb, length);
 }
 
 int bsc_queue_for_msc(struct osmo_bsc_sccp_con *conn, struct msgb *msg)