[S] Change in coreboot[master]: mb/{cfl,cml,whl}: Use true/false macros for eist_enable dt option

[Yuchen He (Code Review)]

Yuchen He has abandoned this change. ( https://review.coreboot.org/c/coreboot/+/76020?usp=email )

Change subject: mb/{cfl,cml,whl}: Use true/false macros for eist_enable dt option
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Abandoned