[coreboot-gerrit] Change in coreboot[master]: arch/x86: Use ENV_X86_64 instead of _x86_64_

[Arthur Heymans (Code Review)]

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/44867 )

Change subject: arch/x86: Use ENV_X86_64 instead of _x86_64_
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Patch Set 1: Code-Review+2

The BUILD_TIMELESS=1 results for both 32 and 64 bit on Q35 remain the same.