Change in coreboot[master]: arch/x86/include: Use IS_ENABLED() macro

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Change subject: arch/x86/include: Use IS_ENABLED() macro
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/9664/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/53923/ : SUCCESS