Using officially released voltha

Change-Id: I52748f117c535f65839f2ca47bb999cbdd93ac48
diff --git a/voltha/Chart.yaml b/voltha/Chart.yaml
index e897aec..41fbcfb 100644
--- a/voltha/Chart.yaml
+++ b/voltha/Chart.yaml
@@ -17,4 +17,4 @@
 icon: https://guide.opencord.org/logos/cord.svg
 
 version: 1.0.2
-appVersion: santa-clara
+appVersion: 1.6.0