Patch merged into coreboot/master: mainboard/google/reef: provide baseboard and variant concepts

the following patch was just integrated into master:
commit 114d7c3ada2db48dd8ec2a845e3869a30e80e12d
Author: Aaron Durbin 
Date:   Fri Sep 2 15:58:16 2016 -0500

mainboard/google/reef: provide baseboard and variant concepts

To further the ability of multiple variant boards to share code
    provide a place to land the split up changes. This patch provides
    the tooling using a new Kconfig value, VARIANT_DIR, as well as
    the Make plumbing. The directory layout with a single variant,
    reef (which is also the baseboard), looks like this:

variants/baseboard - code
    variants/baseboard/include/baseboard - headers
    variants/reef - code
    variants/reef/include/variant - headers

New boards would then add themselves under their board name
    within the 'variants' directory.

No split has been done with providing different logic yet.
    This is purely a organizational change.

BUG=chrome-os-partner:56677

Change-Id: Ib73a3c8a3729546257623171ef6d8fa7a9f16514
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16418
    Tested-by: build bot (Jenkins)
    Reviewed-by: Duncan Laurie

See https://review.coreboot.org/16418 for details.

-gerrit