Change in coreboot[master]: [WIP]soc/intel/common: Add bootblock common stage file

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Change subject: [WIP]soc/intel/common: Add bootblock common stage file
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Patch Set 18: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/29448/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/75398/ : SUCCESS