[coreboot-gerrit] Change in coreboot[master]: mb/lenovo/{t420,t420s}: Convert to variant board

[Peter Lemenkov (Code Review)]

Peter Lemenkov has abandoned this change. ( https://review.coreboot.org/c/coreboot/+/40381 )

Change subject: mb/lenovo/{t420,t420s}: Convert to variant board
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Abandoned

Abandon as is. Will likely propose a new change.