Add SD-RAN grafana dashboard

Change-Id: Id4eb710f037e25ea4bba5e4a016ce70f92cd0c15
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 6039b6a..45595d3 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -103,3 +103,4 @@
   omec: false
   aether: false
   bng: false
+  sdran: false