Update ecr kustomize overlay to pull sidecars from private ecr, not public

[wongma7]

Is this a bug fix or adding new feature? addresses #294 (comment).

What is this PR about? / Why do we need it? some users are in airgapped vpc and cannot pull from public ecr. Instead of having the ecr overlay be a mix of public and private, make it refer to private registry listed at https://docs.aws.amazon.com/eks/latest/userguide/add-ons-images.html.

What testing is done?

$ k apply -k ./deploy/kubernetes/overlays/stable/ecr
serviceaccount/efs-csi-controller-sa created
serviceaccount/efs-csi-node-sa created
clusterrole.rbac.authorization.k8s.io/efs-csi-external-provisioner-role created
clusterrolebinding.rbac.authorization.k8s.io/efs-csi-provisioner-binding created
deployment.apps/efs-csi-controller created
daemonset.apps/efs-csi-node created
csidriver.storage.k8s.io/efs.csi.aws.com created
$ k get po -n kube-system | grep efs
efs-csi-controller-7b5ff6d5b4-84jg2       3/3     Running   0          6s
efs-csi-node-wq4zd                        3/3     Running   0          6s
$ k get po -n kube-system efs-csi-node-wq4zd  -o yaml | grep image:
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/aws-efs-csi-driver:v1.3.3
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/csi-node-driver-registrar:v2.1.0
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/livenessprobe:v2.2.0

$ k get po -n kube-system efs-csi-controller-7b5ff6d5b4-84jg2  -o yaml | grep image:
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/aws-efs-csi-driver:v1.3.3
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/csi-provisioner:v2.1.1
    image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/livenessprobe:v2.2.0

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[kbasv]

/lgtm