[XS] Change in coreboot[main]: mb/google/screebo: Add FW_CONFIG and device for VPU

[Jamie Ryu (Code Review)]

Attention is currently required from: Daniel Kang, Dinesh Gehlot, Eran Mitrani, Jakub Czapiga, Kapil Porwal, Subrata Banik, Tarun, YH Lin.

Jamie Ryu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81560?usp=email )

Change subject: mb/google/screebo: Add FW_CONFIG and device for VPU
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Patch Set 2:

(1 comment)

File src/mainboard/google/rex/variants/screebo/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/81560/comment/a57ed9cc_98f02b35 :
PS1, Line 33: 	field VPU 22
            : 		option VPU_DIS			0
            : 		option VPU_EN			1
            : 	end
> Just curious why is 22 being chosen?

Subrata, YH made config star changes and it is merged now. https://chrome-internal-review.googlesource.com/c/chromeos/project/rex/scree... 
YH, I'd like to keep the same CBI bit definition with rex0 variant for VPU enablement. https://github.com/coreboot/coreboot/blob/main/src/mainboard/google/rex/vari...