Change in coreboot[master]: mb/google/brya/var/taeko: Add judgement for PCIE signal switch

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Kevin Chang, Paul Menzel, YH Lin.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60341 )

Change subject: mb/google/brya/var/taeko: Add judgement for PCIE signal switch
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Patch Set 9:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/60341/comment/24f81bd6_20883a92 
PS9, Line 9: singal
`signal`

https://review.coreboot.org/c/coreboot/+/60341/comment/625042a5_30b5e82a 
PS9, Line 10:  that need add judgement in overridetree.cb.
suggestion:
`In order to accommodate this, probe statements are added to the devicetree`