Add support for LCLS to the MSC

This commit is largely based on work by
Max <msuraev@sysmocom.de>

Adds LCLS parameters for A-interface transactions
This commit also adds a vty option to facilitate globally
disabling LCLS for all calls on this MSC.

Add a global call reference (GCR) to MNCC and therefore
bump the MNCC version to version 8. (This commit has to be
merged at the same time as the corresponing commit in the
osmo-sip-connector for mncc-external use.)

Depends: osmo-sip-connector Id40d7e0fed9356f801b3627c118150055e7232b1
Change-Id: I705c860e51637b4537cad65a330ecbaaca96dd5b
diff --git a/include/osmocom/msc/ran_msg.h b/include/osmocom/msc/ran_msg.h
index 1303ba3..fd2439f 100644
--- a/include/osmocom/msc/ran_msg.h
+++ b/include/osmocom/msc/ran_msg.h
@@ -88,6 +88,7 @@
 	uint8_t osmux_cid;
 	bool call_id_present;
 	uint32_t call_id;
+	struct osmo_lcls *lcls;
 };
 
 struct ran_cipher_mode_command {