kafka integration helm changes

Change-Id: Ie85c9b11dcddc0191ecc3a04d220daa5760105af
diff --git a/voltha-go-controller/values.yaml b/voltha-go-controller/values.yaml
index ce9fe7a..63d5ccc 100644
--- a/voltha-go-controller/values.yaml
+++ b/voltha-go-controller/values.yaml
@@ -103,3 +103,9 @@
 tolerations: []
 
 affinity: {}
+
+# Define connectivity to required services
+services:
+  kafka:
+    cluster:
+      address: kafka:9092