Optimize PowerVS method to fetch bucket region to avoid duplicacy

[ChandrikaHarish]

What this PR does / why we need it:

• Optimize PowerVS method to fetch bucket region to avoid duplicacy. This code cleanup provides one common method for both machine and cluster scope.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Optimize PowerVS method to fetch bucket region to avoid duplicacy

[k8s-ci-robot]

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This pull-request has been approved by: ChandrikaHarish
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[k8s-ci-robot]

Hi @ChandrikaHarish. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[Prajyot-Parab]

@ChandrikaHarish Please update release notes and PR description.

[Prajyot-Parab]

/ok-to-test

[Prajyot-Parab]

/cc @Amulyam24