The spd.bin file was not getting generated properly, so moved logic
to variant's makefile.
BUG=b:64395641
BRANCH=none
TEST=Verify "./util/abuild/abuild -p none -t google/zoombini -x -a"
compiles successfully and spd.bin is found when booting.
Change-Id: I4642d6ddb5e65f721d1bde31ca0ca5b4438da554
Signed-off-by: Nick Vaccaro <nvaccaro@chromium.org>
Reviewed-on: https://review.coreboot.org/23190
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>