[coreboot-gerrit] Change in coreboot[master]: mb/{asrock,intel,siemens}: Define `.chipset_lockdown`

[Maxim Polyakov (Code Review)]

Attention is currently required from:  Felix Singer, Nico Huber, Benjamin Doron, Subrata Banik.
Maxim Polyakov has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50053 )

Change subject: mb/{asrock,intel,siemens}: Define `.chipset_lockdown`
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Patch Set 6: Code-Review+2