Fixed AWS EFS deployment example

[eschizoid]

The purpose of this PR is just to update a deprecated K8s API that no longer works when using AWS EFS.

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[eschizoid]

/assign @wongma7

[eschizoid]

I've already signed the CLA agreement

[humblec]

@eschizoid dont we have CSI drivers avaialable from AWS for EFS ? if yes, can you use that provisioner ? obviously we can review this PR, but bringing another thought here.

[eschizoid]

@humblec IMO the CSI driver template approach should be for a different PR, this is just updating a deprecated API :)

[eschizoid]

can we merge down this bad boy?

[wongma7]

/lgtm /approve thanks. sorry for the wait, am reviewing PRs now!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wongma7

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Needs approval from an approver in each of these files: - ~~[aws/efs/OWNERS](https://github.com/kubernetes-incubator/external-storage/blob/master/aws/efs/OWNERS)~~ [wongma7] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment