Change in ...coreboot[master]: mainboard/{google,intel}: Remove SaGv hard coding

[Angel Pons (Code Review)]

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/31120 )

Change subject: mainboard/{google,intel}: Remove SaGv hard coding
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Patch Set 3:

w.r.t. SaGv being set to 3 on CNL-U and CNL-Y, this may be because the FixedMid option did not exist when the boards were added, so 3 was equal to Enabled. When said FixedMid option was added, 3 became FixedHigh on CNL chips. CB:31132 sets SaGv back to Enabled, as intended.