Change in coreboot[master]: cpu/amd: add IS_ENABLED() around Kconfig symbol references

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Change subject: cpu/amd: add IS_ENABLED() around Kconfig symbol references
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/56147/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/11750/ : SUCCESS