sgsn: fill g_gb configs for the remaining Gb interfaces

When testing with multiple Routing Areas, multiple Gb
interface are required.

Change-Id: I7f56618110f04d99b1b43e69d89167e384b61a34

sgsn/SGSN_Tests.ttcn

@@ -188,6 +188,32 @@ function f_init(BcdMccMnc mcc_mnc := '26242F'H) runs on test_CT {
 		},
 		sgsn_role := false
 	};
+	g_gb[1].cfg := {
+		nsei := 97,
+		bvci := 210,
+		cell_id := {
+			ra_id := {
+				lai := {
+					mcc_mnc := mcc_mnc, lac := 13200},
+					rac := 0
+				},
+			cell_id := 20961
+		},
+		sgsn_role := false
+	};
+	g_gb[2].cfg := {
+		nsei := 98,
+		bvci := 220,
+		cell_id := {
+			ra_id := {
+				lai := {
+					mcc_mnc := mcc_mnc, lac := 13300},
+					rac := 0
+				},
+			cell_id := 20962
+		},
+		sgsn_role := false
+	};
 
 	f_init_gb(g_gb[0], "SGSN_Test-Gb0");
 	f_init_gsup("SGSN_Test");