[coreboot-gerrit] Change in coreboot[master]: mb/clevo/{kbl-u,cml-u}: Replace `def_bool` with `bool`

[Felix Singer (Code Review)]

Felix Singer has restored this change. ( https://review.coreboot.org/c/coreboot/+/52805 )

Change subject: mb/clevo/{kbl-u,cml-u}: Replace `def_bool` with `bool`
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Restored