Fix IBMPowerVSImage deletion

[Prajyot-Parab]

Signed-off-by: Prajyot-Parab [email protected]

What this PR does / why we need it:
Fix IBMPowerVSImage deletion

• Delete IBMPowerVSImage on deletion of IBMPowerVSCluster

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 #538

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:

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[k8s-ci-robot]

Hi @Prajyot-Parab. 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. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mkumatag]

few minor comments, otherwise lgtm

[mkumatag]

/ok-to-test

[mkumatag]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mkumatag, Prajyot-Parab

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