COCONUT EDK2 fork rebased

Hi,
we just rebased the `svsm` branch of our edk2 fork on the upstream
`stable202505` release, which also contains the SVSM TPM driver.

The `svsm` branch contains just 2 patches on top of `stable202505` to
fix a known issue with major Linux distributions and to disable the
fallback reboot of shim. See
https://github.com/coconut-svsm/edk2/pull/7 for more details.

For the rebase we had to force push the PR content, so if you have the
old reference you have to reset HEAD in this way:

  git checkout svsm
  git fetch origin
  git reset --hard origin/svsm

Thanks,
Stefano