Add support for setting the CST backend, both via DT property and
CST_BACKEND environment variable. The CST currently supports two
backends, 'ssl' and 'pkcs11', with 'ssl' being the default when
CST tool is invoked without any -b parameter. Keep 'ssl' backend
as the default, but explicitly pass it via the '-b' parameter,
unless the user selects 'pkcs11' via either method.
Signed-off-by: Marek Vasut <marex@nabladev.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Marek VasutandFabio Estevam
4eeaaee054