Change in coreboot[master]: [WIP]soc/intel/apollolake: Add support for GSPI

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Change subject: [WIP]soc/intel/apollolake: Add support for GSPI
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/68008/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/22485/ : SUCCESS