[coreboot] Add legacybios to buildrom

[Myles Watson]

This is the same patch I posted earlier which adds legacybios to
buildrom.  It has some options hardcoded in hardcode.diff because it
seems like the easiest way to keep the configuration in one place.

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

Thanks,
Myles
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