[coreboot] ADLO for buildrom

[Myles Watson]

>  > I'm fine using the git version which corresponds to a released tarball
>  > in the normal case, but for now (in order to get the fixes for gcc 4.2/4.3)
>  > I'd say we use the currently latest git.

This patch updates the legacybios version to 2.2 (the latest) and thus
avoids git.

>  I just want to say - fear the git fetcher in buildrom.  There be
>  dragons.
>
>  Jordan

This patch addresses most concerns not related to the loader.  I hope
that it will be rewritten soon.  The payloads.adlo.diff patch is the
same as the last.  I'm including it for completeness.

I think that committing this into the repository is worth the 20K.  It
has already generated more discussion than ADLO has for a long time.
The ease of using it with buildrom should speed testing and bug
fixing.

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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