Change in coreboot[master]: libpayload: enable cache and Write through

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Change subject: libpayload: enable cache and Write through
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/67017/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/21592/ : SUCCESS