[coreboot] port nvramtool to FreeBSD

[Andriy Gapon]

Allow nvramtool to build and work on FreeBSD.

Signed-off-by: Andriy Gapon <avg at icyb.net.ua>

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Again this is done using the same technique as for flashrom and superiotool.
Tested on FreeBSD 7.

BTW, any news on official release of flashrom?

-- 
Andriy Gapon
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