Change in coreboot[master]: soc/intel/cannonlake: Add ramstage SystemAgent support

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Change subject: soc/intel/cannonlake: Add ramstage SystemAgent support
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Patch Set 2: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/58340/ : FAILURE

https://qa.coreboot.org/job/coreboot-checkpatch/13751/ : SUCCESS