Patch merged into coreboot/master: mainboard/google/reef: prepare sharing directory for variants

the following patch was just integrated into master:
commit 4435a490cd48d6964e656baeeaec0b48a9053d13
Author: Aaron Durbin 
Date:   Thu Sep 1 16:11:52 2016 -0500

mainboard/google/reef: prepare sharing directory for variants

Instead of completely duplicating the a reference board's directory
    when doing a variant or follower device start providing a means to
    share code within a single directory. This change just starts the
    process from the Kconfig side, but subsequent patches will follow
    which disentangles the board specific pieces from and common
    logic.

BUG=chrome-os-partner:56677

Change-Id: I96628920d78012e488ec008e35daac9c1be0cf79
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16417
    Tested-by: build bot (Jenkins)
    Reviewed-by: Duncan Laurie

See https://review.coreboot.org/16417 for details.

-gerrit