[XS] Change in coreboot[main]: mb/google/rex/var/karis: Add FAN field in fw_config

[Tyler Wang (Code Review)]

Attention is currently required from: David Wu, Eran Mitrani, Eric Lai, Kapil Porwal, Paul Menzel, Tarun, YH Lin.

Tyler Wang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78216?usp=email )

Change subject: mb/google/rex/var/karis: Add FAN field in fw_config
......................................................................

Patch Set 7:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/78216/comment/9997de93_ac3094e5 :
PS5, Line 9: FAN_SETTING_1
> Please elaborate what setting 1 is.

Done, thanks.

https://review.coreboot.org/c/coreboot/+/78216/comment/945b8adb_296842da :
PS5, Line 12: TEST=emerge-rex coreboot
> Do you have access to the board?

Yes, update test result.