[VOL-5020] - Update repo:voltha-helm-charts

bbsim/Chart.yaml
----------------
  o Update bbsim to v1.15.2

voltha-adapter-openolt/Chart.yaml
---------------------------------
  o Update openolt adapter to v4.3.6

Change-Id: I007101436028ce511a3495113c5cad5283ebe0d0
diff --git a/voltha-adapter-openolt/Chart.yaml b/voltha-adapter-openolt/Chart.yaml
index f8cab2d..03c5145 100644
--- a/voltha-adapter-openolt/Chart.yaml
+++ b/voltha-adapter-openolt/Chart.yaml
@@ -33,4 +33,6 @@
 
 # appVersion refers to multiple components with potentially different
 # container image versions.
-appVersion: "4.3.2"
+appVersion: "4.3.6" # [REL] "4.3.5"
+
+# [EOF]