gbproxy: Remove NUM_BVC_PER_NSE constant and constant-sized array

Let's use a 'record of' with indefinite length in order to be able to
dynamically adjust the number of BSSGP_BVC_CT references based on how
many BVCs we have configured.

Change-Id: Id4aa20ff0b553cb8a1f5a67faa1e7b237fb254b8
diff --git a/gbproxy/GBProxy_Tests.ttcn b/gbproxy/GBProxy_Tests.ttcn
index 874679d..e6c07d7 100644
--- a/gbproxy/GBProxy_Tests.ttcn
+++ b/gbproxy/GBProxy_Tests.ttcn
@@ -187,13 +187,13 @@
 	}
 };
 
-const integer NUM_BVC_PER_NSE := 3;
 type record GbInstance {
 	NS_CT vc_NS,
 	BSSGP_CT vc_BSSGP,
-	BSSGP_BVC_CT vc_BSSGP_BVC[NUM_BVC_PER_NSE],
+	BSSGP_BVC_CTs vc_BSSGP_BVC,
 	BssgpConfig cfg
 };
+type record of BSSGP_BVC_CT BSSGP_BVC_CTs
 
 const integer NUM_PCU := 3;
 type record of GbInstance GbInstances;