Make POD's node selector can configure in values.yaml

Change-Id: Ia6b4588546fda60ea2cd9ec581a017826cac9f66
diff --git a/mcord/mcord-control-plane/templates/cp.yaml b/mcord/mcord-control-plane/templates/cp.yaml
index 2197347..37ae75f 100644
--- a/mcord/mcord-control-plane/templates/cp.yaml
+++ b/mcord/mcord-control-plane/templates/cp.yaml
@@ -63,7 +63,7 @@
         app: ngic-cp
     spec:
       nodeSelector:
-        kubernetes.io/hostname: "node2"
+        kubernetes.io/hostname: "{{ .Values.spgwc_node_selector }}"
       initContainers:
       - name: init-iptables
         image: {{ .Values.ngic_cp.images.init }}