helm: enable prometheus metrics in cilium-operator

Cilium operator also needs the option metrics-enabled to be set in order
for its prometheus metrics be made available.

Signed-off-by: André Martins <andre@cilium.io>

install/kubernetes/cilium/charts/config/templates/configmap.yaml

@@ -65,6 +65,7 @@ data:
   # NOTE that this will open the port on the nodes where Cilium operator pod
   # is scheduled.
   operator-prometheus-serve-addr: ":{{ .Values.global.operatorPrometheus.port }}"
+  enable-metrics: "true"
 {{- end }}
 
   # Enable IPv4 addressing. If enabled, all endpoints are allocated an IPv4