Reenable the privileged PSP for all users

To revert to the default MKE configuration in which all MKE users and service accounts use the privileged PSP, while signed in as a cluster admin, recreate the default ClusterRoleBinding:

cat <<EOF | kubectl create -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: ucp:all:privileged-psp-role
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: privileged-psp-role
subjects:
- kind: Group
  name: system:authenticated
  apiGroup: rbac.authorization.k8s.io
- kind: Group
  name: system:serviceaccounts
  apiGroup: rbac.authorization.k8s.io
EOF