Cleanup: refactor powervs cloud to remove extra params

[yussufsh]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
This will help with writing tests for the cloud library.

Release note:

none

[yussufsh]

/retest required

[k8s-ci-robot]

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[yussufsh]

/retest

[mkumatag]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mkumatag, yussufsh

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