This is based on the code from #33276, but is cleaned up, and goes for a modified approach: the original PR allocated nvindexes fully dynamically, and that created big headaches, because the assignments needed to be propagated into the early boot process, and that meant stuffing them as sidecards to the boot UKIs. The TCG then offered us a fixed nvindex range assigned to us, and happily said yes to that, but since then the discussion stalled, we couldn't get any answer from TCG on this anymore. This code uses the range that was hinted to us to use, but not officially assigned to us by default, but makes it build time configurable so that downstreams can change this. (This does *not* make it runtime configurable, because that's really hard, because of the early boot issue again). This PR comes with a CI test and full docs. And I think this is really a version should that be merged. Fixes: https://github.com/systemd/systemd/issues/29877
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