Adding params for voltha images

Change-Id: I47286050d58dfffdcaee79c07b2b378afb00077e
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 41b0e30..dec2e1d 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -68,6 +68,8 @@
 ofagentImage: 'voltha/voltha-ofagent:1.4.0'
 vcliImage: 'voltha/voltha-cli:1.4.0'
 vcoreImage: 'voltha/voltha-voltha:1.4.0'
+httpBackendImage: 'gcr.io/google_containers/defaultbackend:1.4'
+ingressControllerImage: 'quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.10.2'
 
 # Need the namespace global for kafka
 global: