Change in coreboot[master]: soc/amd/stoneyridge: Clarify BAR mask in SPI base

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Change subject: soc/amd/stoneyridge: Clarify BAR mask in SPI base
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/57910/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13355/ : SUCCESS