[coreboot] EPIA halting after vt8601 init

[Myles Watson]

>> > Loading stage image.
>> > Check CBFS header at <hangs here>
>> Normally a hang here means that the whole ROM isn't mapped, so trying
>> to read from the top of the ROM hangs, even though the bootblock
>> accesses work fine.
>
> Yup, sounds like that's the problem. Here's a quick patch to fix it
> by adding a rom_enable() function (and converting VT8231 to
> TINYBOOTBLOCK) while I'm at it. The only problem: It won't compile ;)
>
> No time to investigate right now, if someone else sees the problem,
> please feel free to fix and commit. Probably just some missing
> "#if defined(ROMCC)" or the like.
I just simplified the patch.  TINYBOOTBLOCK can come later.

It compiles.

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

Thanks,
Myles
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