VOL-3727 Adding enableOnuStats and enableGemStats flags to openolt helm chart

Change-Id: I753fadcca6ddc1c1c413f3e1771605c37f54373b
diff --git a/voltha-adapter-openolt/values.yaml b/voltha-adapter-openolt/values.yaml
index 3eb051d..f1d7e11 100644
--- a/voltha-adapter-openolt/values.yaml
+++ b/voltha-adapter-openolt/values.yaml
@@ -28,6 +28,10 @@
 
   #enable OMCC encryption
   omcc_encryption: false
+  #enable ONU stats
+  enable_onu_stats: false
+  #enable GEM stats
+  enable_gem_stats: false
 
   # Configure Log Correlation
   log_correlation: