Change in coreboot[master]: boardid: Switch from Kconfig to weak functions

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/22695 )

Change subject: boardid: Switch from Kconfig to weak functions
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Patch Set 4:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/64239/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/19064/ : SUCCESS