[VOL-5506] Disable service monitor by default

Change-Id: Ia0d553fb428e859e320518ca6d58ad8b125ffe05
Signed-off-by: Abhay Kumar <abhay.kumar@radisys.com>
diff --git a/voltha-go-controller/values.yaml b/voltha-go-controller/values.yaml
index 0be450a..22b67d3 100644
--- a/voltha-go-controller/values.yaml
+++ b/voltha-go-controller/values.yaml
@@ -122,3 +122,6 @@
     type: "etcd"
     address: "voltha-infra-etcd-headless.infra.svc.cluster.local"
     port: "2379"
+
+serviceMonitor:
+    enable: false