[coreboot] cbfstool extract

[Myles Watson]

This patch adds

cbfstool extract [FILE] [NAME]

It also factors out the csize calculation in rom_add.

As a side note cbfstool delete is broken.  It only works correctly
when you are not deleting the last entry.

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

Thanks,
Myles
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