Adding a dashboard for VOLTHA-2.x, disabled by default

Change-Id: Iaa41974a62cdeb112961aa048d2a93d19c82ed61
diff --git a/nem-monitoring/templates/grafana-dashboard-configmap.yaml b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
index 59a0410..9d7c0e2 100644
--- a/nem-monitoring/templates/grafana-dashboard-configmap.yaml
+++ b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
@@ -44,6 +44,10 @@
   voltha.json: |
 {{ .Files.Get "grafana-dashboards/voltha-kpi.json" | indent 4 }}
 {{- end }}
+{{- if .Values.dashboards.voltha2 }}
+  voltha2.json: |
+{{ .Files.Get "grafana-dashboards/voltha-2x.json" | indent 4 }}
+{{- end }}
 {{- if .Values.dashboards.omec }}
   omec.json: |
 {{ .Files.Get "grafana-dashboards/omec.json" | indent 4 }}