passt: Add memory overhead

[orelmisan]

What this PR does / why we need it: Following PR https://github.com/kubevirt/kubevirt/pull/12235, it is now possible to specify memory overhead for the virt-launcher's compute container.

Instruct users of the passt binding plugin to register it with a memory overhead of 500Mi for the compute container.

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:

Checklist

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• [ ] Design: A design document was considered and is present (link) or not required
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• [ ] Code: Write code that humans can understand and Keep it simple
• [ ] Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• [ ] Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• [ ] Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• [ ] Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
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Release note:

None

[orelmisan]

/cc @EdDev @ormergi

[orelmisan]

/uncc @cwilkers @stu-gott

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: phoracek

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