Patch merged into coreboot/master: google/reef: Remove VARIANT_DIR definition

the following patch was just integrated into master:
commit d03391aa68f93b7d87370e9d63f3ec71a7f68dd0
Author: Martin Roth 
Date:   Tue Dec 13 10:31:06 2016 -0700

google/reef: Remove VARIANT_DIR definition

VARIANT_DIR is defined in coreboot/Makefile.inc, so doesn't need to be
    defined in each mainboard.

Change-Id: Ic93957b710e4a9863774de7fcf3bd006696b6aa1
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/17841
    Tested-by: build bot (Jenkins)
    Reviewed-by: Nico Huber 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/17841 for details.

-gerrit