Change in coreboot[master]: src/mainboard/Kconfig: split out options into own file

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Change subject: src/mainboard/Kconfig: split out options into own file
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/14715/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/59406/ : SUCCESS