Change in coreboot[master]: mainboard/{intel, google}: Make use of commom SMM code for mainboards

[Subrata Banik (Code Review)]

Subrata Banik has removed Balaji Manigandan from this change.  ( https://review.coreboot.org/22827 )

Change subject: mainboard/{intel, google}: Make use of commom SMM code for mainboards
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Removed reviewer Balaji Manigandan.