vgcEnabled parameter handling for VGC Deploy

Change-Id: I1cc91698ba9f224bf6326b7908c8cc233745cee8
Signed-off-by: Guru <guruprasanna.st@radisys.com>
diff --git a/vars/volthaDeploy.groovy b/vars/volthaDeploy.groovy
index defcaf6..af013c7 100644
--- a/vars/volthaDeploy.groovy
+++ b/vars/volthaDeploy.groovy
@@ -82,6 +82,7 @@
         stackName        : 'voltha',
         stackId: 1,
         workflow         : 'att',
+        vgcEnabled       : false,
         withMacLearning: false,
         withFttb: false,
         extraHelmFlags   : '',