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

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/20345 )

Change subject: nb/amd: add IS_ENABLED() around Kconfig symbol references
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/56506/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/12091/ : SUCCESS