Change in coreboot[master]: mb/google/brya/var/kano: Disable unused PCIE root port in devicetree

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Grace Kao, David Wu.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58566 )

Change subject: mb/google/brya/var/kano: Disable unused PCIE root port in devicetree
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Patch Set 2: Code-Review+2

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/58566/comment/a307d7be_7574d45e 
PS2, Line 7: port
`port`

https://review.coreboot.org/c/coreboot/+/58566/comment/2a8ea416_079bffc2 
PS2, Line 8: 
           : Based on latest schematic to disable PCIE port 6/8/9 (WWAN/SD/SSD).
suggestion:
```
The baseboard enables PCIe RPs 6, 8 and 9, but kano doesn't use
these. Having them enabled will occasionally cause suspend
attempts to fail, therefore disable them in the overridetree.
```