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GDT and TSS changes (with find fix)

rsahwerequested to merge
rsahwe/aurix:main into main

The find fix is that for GNU find (aka linux find), -name only matches the name and -wholename fixes the issue.

For the GDT, the user segments have to be reordered for sysret (even if it is not used I think it's okay to do this) and the TSS is added,

which is important for alternate stacks for interrupts like the page fault or double fault (which could trigger a triple fault without the TSS),

as well as the stacks used when switching to a lower ring.

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