[U-Boot] Bogus message about SCSI during build

[Andy Shevchenko]

Hi!

Since X86 implies SCSI and Intel Edison board does not use it, I have got a
===================== WARNING ======================
This board does not use CONFIG_DM_SCSI. Please update
the storage controller to use CONFIG_DM_SCSI before the v2019.07 release.
Failure to update by the deadline may result in board removal.
See doc/driver-model/MIGRATION.txt for more info.
====================================================

Is anybody aware of?

-- 
With Best Regards,
Andy Shevchenko