Makefile.inc: export VARIANT_DIR as top-level variable

export VARIANT_DIR at the top level, rather than doing so multiple
times at the SoC / board level

Change-Id: If825701450c78289cb8cca731d589e12aafced11
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/17451
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed