NXP Code signing Tool for the High Assurance Boot library is needed for
signing and encrypting different artifacts (U-Boot image, uImage, ...).
As the CST cannot be included in DEY, the user needs to download the
tarball and add it to the recipe folder.
https://jira.digi.com/browse/DUB-618
Signed-off-by: Diaz de Grenu, Jose <Jose.DiazdeGrenu@digi.com>
Diaz de Grenu, Jose