Add missing #include in vboot_api.h

This includes stdlib.h since otherwise size_t might not be defined.

BUG=none
BRANCH=none
TEST=fixed a compilation issue with coreboot
Signed-off-by: David Hendricks <dhendrix@chromium.org>

Change-Id: I83e2b761d2d8e0d4899c9bdebf40190f1444cd8a
Reviewed-on: https://chromium-review.googlesource.com/199840
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
1 file changed