Change in coreboot[master]: soc/intel/tigerlake/apci: Only use SCM for ChromeOS

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Tim Crawford, Sean Rhodes, Jeremy Soller, Patrick Rudolph.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58798 )

Change subject: soc/intel/tigerlake/apci: Only use SCM for ChromeOS
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Patch Set 12: Code-Review+2

(2 comments)

File src/soc/intel/tigerlake/acpi/tcss.asl:

https://review.coreboot.org/c/coreboot/+/58798/comment/2304c224_6c84b3c6 
PS10, Line 156: 			Return (Arg3)
> or even building on the below, would it also be correct to do something like […]

decided to leave this as-is for now, will dig into a better solution later

https://review.coreboot.org/c/coreboot/+/58798/comment/dda9b228_7233f160 
PS10, Line 190: Local0 |= USB_TUNNELING | DISPLAY_PORT_TUNNELING | PCIE_TUNNELING |
              : 				INTER_DOMAIN_USB4_INTERNET_PROTOCOL
> Up to you, Google has more TGL boards than us and System76 combined but... […]

decided to leave this as-is for now, will dig into a better solution later