[L] Change in coreboot[main]: Add support for MiTAC Computing Whitestone-2 mainboard

[Angel Pons (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Christian Walter, Jincheng Li, Lean Sheng Tan, Mark Chang, Patrick Rudolph, [e-mail].

Angel Pons has posted comments on this change by Mark Chang. ( https://review.coreboot.org/c/coreboot/+/85532?usp=email )

Change subject: Add support for MiTAC Computing Whitestone-2 mainboard
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Patch Set 4: Code-Review+2

(1 comment)

File src/mainboard/mitaccomputing/whitestone-2/include/sprsp_ws_2_iio.h:

https://review.coreboot.org/c/coreboot/+/85532/comment/6e4428df_187628b8?usp... :
PS4, Line 98: IIO_BIFURCATE_xxxxxx16,
            : 		IIO_BIFURCATE_xxx8xxx8,
            : 		IIO_BIFURCATE_xxxxxx16,
            : 		IIO_BIFURCATE_xxxxxx16,
            : 		IIO_BIFURCATE_xxxxxx16,
With the `CFG_UPD_PCIE_PORT_DISABLED` macro, it's easy to see how IIO bifurcation correlates to PCIe port settings :D