MSC pooling: make NRI mappings VTY configurable

Use the osmo_nri_ranges API to manage each MSC's NRI ranges by VTY
configuration.

Change-Id: I6c251f2744d7be26fc4ad74adefc96a6a3fe08b0
diff --git a/include/osmocom/bsc/bsc_msc_data.h b/include/osmocom/bsc/bsc_msc_data.h
index 43adaec..6e29bfe 100644
--- a/include/osmocom/bsc/bsc_msc_data.h
+++ b/include/osmocom/bsc/bsc_msc_data.h
@@ -179,6 +179,8 @@
 		/* UDP socket for proxying MGCP via SCCPlite/IPA */
 		struct osmo_fd ofd;
 	} mgcp_ipa;
+
+	struct osmo_nri_ranges *nri_ranges;
 };
 
 int osmo_bsc_msc_init(struct bsc_msc_data *msc);