addons: remove namespace for network-policies clusterrole

Signed-off-by: xin.li <xin.li@daocloud.io>

cluster/addons/kube-network-policies/kube-network-policies-rbac.yaml

@@ -2,7 +2,6 @@ kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: system:network-policies
-  namespace: kube-system
   labels:
     addonmanager.kubernetes.io/mode: Reconcile
 rules: