[coreboot] port superiotool to FreeBSD

[Andriy Gapon]

allow superiotool to compile and work on FreeBSD
using the same approach as earlier flashrom port

Signed-off-by: Andriy Gapon

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This is tested on FreeBSD 7, dump for W83977EF/EG that I sent previously
was obtained using this patch.

It seems that this approach can also be extended to all coreboot (and
utils) code that uses inX/outX (it is quite unfortunate that Linux and
BSD use different order of parameters for outX).