[coreboot] [flashrom] covert to coreboot's pci function style, add libpayload compile support; makefile needs some work

[Sean Nelson]

Flashrom patched for compiling with libpayload while still being able
to compile with libpciutil; uses coreboot styled pci function names
found in libpayload.

Signed-off-by: Sean Nelson

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I've converted flashrom to use coreboot's pci style function naming.
flash.h holds majority of code to translate pci functions to use
libpciutil, and add additional code/functions need in libpayload. I
tried to make minimal structural changes. I'd suggest someone
re-implement or structure this patch into something more beautiful,
and put in additional work with the Makefile.
Maybe move some of the libpayload functions found in flash.h into libpayload.