Change in coreboot[master]: util : Add sgxtool

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/20041 )

Change subject: util : Add sgxtool
......................................................................

Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/10685/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/54999/ : SUCCESS