[coreboot] Fix some PCI issues on M57SLI v2

[Uwe Hermann]

> Index: mptable.c
> ===================================================================
> --- mptable.c	(revision 4027)
> +++ mptable.c	(working copy)

Please always add a Signed-off-by to all patches you send, see

http://www.coreboot.org/Development_Guidelines#Sign-off_Procedure


Thanks, Uwe.
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