Enable possibility to use capabilities in images jobs

[jmguzik]

Make additional architectures field deprecated and prefer capabilities over additional arches in prowgen

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jmguzik

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[jmguzik]

/test lint

[jmguzik]

/override ci/prow/e2e
not needed here

[openshift-ci]

@jmguzik: Overrode contexts on behalf of jmguzik: ci/prow/e2e

In response to this:

/override ci/prow/e2e
not needed here

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[openshift-ci]

@jmguzik: The following tests 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/images	970713a	link	true	/test images
ci/prow/breaking-changes	970713a	link	false	/test breaking-changes

Full PR test history. Your PR dashboard.

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