libpayload: Refer to vboot source consistently

Don't assume that libpayload is built from a fully checked
out coreboot tree.
There's already an override when building vboot, so reuse
that override when referring to its header files.

Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Change-Id: I503c69a593dd68b3a974fbdbb64d7bb25d6c7f63
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61427
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Rob Barnes <robbarnes@google.com>

0 files changed, 0 insertions, 0 deletions