QEMU downstream fork rebased on top of v11.0.0

Hi all,
we just rebased our QEMU fork (https://github.com/coconut-svsm/qemu)
to upstream QEMU v11.0.0 [1]. This allowed us to remove several
patches related to ACPI/MADT and native platform support since they
are merged upstream. Thanks to Oliver and Luigi for the rebase.

So the `svsm-igvm` branch of our QEMU fork was force-pushed with the
new version. Locally, you need the following steps to align:
    git checkout svsm-igvm
    git fetch
    git reset --hard origin/svsm-igvm

`scripts/test-in-svsm.sh` is also updated [2] to work with the new
QEMU, while continuing to work with the old version as well. You need
the new version of the script only if you use `--nocc` (native mode)
with the new QEMU.

Thanks,
Stefano


[1] https://github.com/coconut-svsm/qemu/pull/32
[2] https://github.com/coconut-svsm/svsm/pull/1058