Change in coreboot[master]: spi/tpm: Make sure AP properly syncs up with Cr50

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Change subject: spi/tpm: Make sure AP properly syncs up with Cr50
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Patch Set 6: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/17785/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/62789/ : SUCCESS