Using santa-clara images for VOLTHA as default

Change-Id: Ia95d8ac89a9bb79a2b871658b916425c39798704
diff --git a/voltha/Chart.yaml b/voltha/Chart.yaml
index 241d78f..e897aec 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: latest
+appVersion: santa-clara