Change in coreboot[master]: soc/intel/common: Add function to get soc reserved memory size

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Change subject: soc/intel/common: Add function to get soc reserved memory size
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Patch Set 9:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/60869/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16055/ : SUCCESS