[coreboot] ACPI_BIOS_ERROR windows boot error with PCIe GPU

[vladocb via coreboot]

Hi,
I'm trying to boot Windows 10 with Coreboot 4.9.2002 using Tianocore + a PCIe 
GPU and I always get an strange ACPI_BIOS_ERROR.

Without the PCIe GPU, works ok.

I'm pretty sure is an error with my DSDT or the southbridge code.
Sadly, I cannot debug Windows to know determine the exact ACPI problem.
I also tested with other boards like the Asus Maximus IV GeneZ and the problem 
is there too: with the IGP only works, but when I attach a PCIe GPU then it 
crashes.

Take a look to my code if you want, any help about this will be welcome.
https://review.coreboot.org/c/coreboot/+/33328

Thanks.
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