Add helm repo update

Change-Id: Ia7c9e326cfc4bc79b7b5f40731dadca2561e5c33
diff --git a/seba-in-a-box/Makefile b/seba-in-a-box/Makefile
index df46c07..5a2ae53 100644
--- a/seba-in-a-box/Makefile
+++ b/seba-in-a-box/Makefile
@@ -136,6 +136,7 @@
 	done
 	helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com/
 	helm repo add cord https://charts.opencord.org
+	helm repo update
 	touch $@
 
 $(WORKSPACE)/cord/helm-charts: | $(M)/setup