Change in coreboot[master]: Kconfig: Allow creating a second bootblock

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Change subject: Kconfig: Allow creating a second bootblock
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/71026/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/25202/ : SUCCESS