Make nfs-client ARM deployment consistent with regular deployment.

[geerlingguy]

I happen to be using the nfs-client provisioner for a project which runs Kubernetes on both ARM and AMD64 platforms, so I was trying to see what differences there were in the deployment (since there's one specific for ARM).

A diff showed a number of differences, but it seems that they are probably just the result of the two manifests getting out of sync (especially evidenced by the fact that the ARM manifest uses the deprecated serviceAccount instead of serviceAccountName).

I've made it so the ARM manifest matches the normal one; the only difference is the addition of the -arm to the end of the image name (which I've preserved).

Merging this PR will help people be able to see the exact, (currently) single difference between the templates to help them template the manifest or just to understand what's different.

I'm not sure what 'ifs' is, but I figure it's better to be consistent with the primary deployment manifest than have something that makes sense to me :)

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[geerlingguy]

I have signed the contributor's agreement.

[wongma7]

/lgtm
/approve
thank you. i think "ifs" is just an example directory, but agree let's be consistent to avoid confusion

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