no-jira: PowerVS: Fix COS region and VPC subnets

[hamzy]

1. We should be passing in a translated VPC region for the COS bucket.
2. The cluster-api-provider-ibmcloud uses a fixed set of subnets per VPC. So, until we can ask the provider what it is, bring that data in so we can use it.

[openshift-ci-robot]

@hamzy: This pull request explicitly references no jira issue.

In response to this:

1. We should be passing in a translated VPC region for the COS bucket.
2. The cluster-api-provider-ibmcloud uses a fixed set of subnets per VPC. So, until we can ask the provider what it is, bring that data in so we can use it.

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[hamzy]

/assign @r4f4

[openshift-ci]

@hamzy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/okd-e2e-aws-ovn-upgrade	1353744	link	false	/test okd-e2e-aws-ovn-upgrade

Full PR test history. Your PR dashboard.

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[r4f4]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: r4f4

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[mjturek]

/lgtm

[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build ose-installer-altinfra-container-v4.16.0-202404011414.p0.gb4e19a0.assembly.stream.el8 for distgit ose-installer-altinfra.
All builds following this will include this PR.