scripts: add derive_rpmb_key.py

Adds the script derive_rpmb_key.py that can derive the RPMB key OP-TEE uses
offline or in normal world during a production step.

Signed-off-by: Jens Wiklander <jens.

scripts: add derive_rpmb_key.py

Adds the script derive_rpmb_key.py that can derive the RPMB key OP-TEE uses
offline or in normal world during a production step.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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