libreboot will still include microcode updates
by default, but mitigations against broken speedstep
and reboot (when microcode updates are excluded) were
removed following the merge with osboot

this patch restores those mitigations; the patch
reverts coreboot to older smrr code (which works fine, it
isn't critical to use the new behaviour) and disables peci
(pointless feature)

i'll probably re-tool this later to apply the changes
conditionally to whether ucode is present

this is not a change in policy. policy says:
include cpu microcode updates by default

policy also says:
libreboot must be configurable

microcode removal via cbfstool remove -n, counts as
configuration, and in practise is not possible on
gm45 patches in current libreboot; this patch corrects
that problem, allowing the machines to work somewhat
well (same stability issues as before, like MCE errors
resulting in kernel panic on high CPU/memory usage,
but i digress)

happy... hacking

352MB VRAM causes stability issues, according to some reports

users can still set it to the higher level when building, if
they wish to

e.g.

./ifdtool --nuke me coreboot.rom

this will be used by rom release build scripts, to scrub
stuff like intel me from the rom

New x230edp_12mb target uses the
https://review.coreboot.org/c/coreboot/+/28950 patchset to add an
X230_EDP target to the default coreboot branch.
Consequently the "fhd" coreboot branch is no longer needed and has
been safely removed.

backported from newer coreboot revisions, see patch

coreboot/default/patches/0014-coreboot-default-fix-crossgcc-build.patch

osboot is now part of libreboot, and will soon shut down.
libreboot now conforms to osboot policy.

with this change, it's unlikely we'll hit errors again. previously,
some projects used were calling "python" which in context was
python3, but on some setups, the user only has python2 and python3
but no symlink for "python" (which if exists, we assumed linked to
python3)

now it's unambiguous. docs/build/ can probably be updated now, as
a result of this change, to remove the advice about that