[coreboot] [flashrom] support for delta mp2-bx-x motherboard (tested)

[Andriy Gapon]

Add support for Delta MP2-BX-X motherboard.
It requires lowering of of PIIX4 GPO#28 for write access.
http://www.geocities.com/SiliconValley/3686/delta_mp2.html

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

This board can not be uniquely identified by PCI devices, all of them
are part of 440BX/PIIX4E chipset.

P.S.
I sent this patch to the list before, but decided to re-send it again.
I successfully tested the attached patch with flashrom on FreeBSD for 
both reading and writing.
Flash RAM chip is SST39SF020.

-- 
Andriy Gapon

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