Change in coreboot[master]: cpu/x86/smm: Add define for AMD64 save area

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/21499 )

Change subject: cpu/x86/smm: Add define for AMD64 save area
......................................................................

Patch Set 8:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61129/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16297/ : SUCCESS