Fix:
cc1: error: ../../src/vendorcode/eltan/security/include: No such file or directory [-Werror=missing-include-dirs]
Change-Id: I806b106c641d0d93ed18c87cf6d863c1cce04b03
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71298
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>