Update typo error, ssh key and ansible vars

[sudharshanibm]

• vpc SSH key was changed from k8s-s390x-prow-ssh-key to k8s-s390x-ssh-key
• extra-vars were added:
• backslash spacing adjusted in the TF invocation

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[k8s-ci-robot]

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This pull-request has been approved by: sudharshanibm
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