Fix csi hostpath custom registry error

[tzzcfrank]

Fix the problem that the image address in the csi hostpath template is fixed and cannot be customized.

[k8s-ci-robot]

Hi @tzzcfrank. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[spowelljr]

Thanks for the fix!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spowelljr, tzzcfrank

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