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

[Arthur Heymans (Code Review)]

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/18457 )

Change subject: soc/intel/common: Add bootblock common stage file
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Patch Set 33:

with CB:36711 cpu/intel/car/bootblock.c you have prototypes to more or less do the same. Maybe you can reuse it?