[FMV] Require all function versions declared in TU with default defin…

[labrinea]

…ition.

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name: Pull request about: Technical issues, document format problems, bugs in scripts or feature proposal.

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Thank you for submitting a pull request!

If this PR is about a bugfix:

Please use the bugfix label and make sure to go through the checklist below.

If this PR is about a proposal:

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We would like to encourage you reading through the contribution guidelines, in particular the section on submitting a proposal.

Please use the proposal label.

As for any pull request, please make sure to go through the below checklist.

Checklist: (mark with X those which apply)

• [ ] If an issue reporting the bug exists, I have mentioned it in the PR (do not bother creating the issue if all you want to do is fixing the bug yourself).
• [ ] I have added/updated the SPDX-FileCopyrightText lines on top of any file I have edited. Format is SPDX-FileCopyrightText: Copyright {year} {entity or name} <{contact informations}> (Please update existing copyright lines if applicable. You can specify year ranges with hyphen , as in 2017-2019, and use commas to separate gaps, as in 2018-2020, 2022).
• [ ] I have updated the Copyright section of the sources of the specification I have edited (this will show up in the text rendered in the PDF and other output format supported). The format is the same described in the previous item.
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• [ ] I have added an item that describes the changes I have introduced in this PR in the section Changes for next release of the section Change Control/Document history of the document. Create Changes for next release if it does not exist. Notice that changes that are not modifying the content and rendering of the specifications (both HTML and PDF) do not need to be listed.
• [ ] When modifying content and/or its rendering, I have checked the correctness of the result in the PDF output (please refer to the instructions on how to build the PDFs locally).
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• [ ] Please DO NOT add my GitHub profile to the list of contributors in the README page of the project.

[ilinpv]

@rsandifo-arm @DanielKristofKiss

[labrinea]

Thanks!

[rsandifo-arm]

LGTM too.