drivers: caam: add DEK blob support

The CAAM can generate a specific key blob called DEK blob - Data
Encryption Key blob. It encapsulates and encrypts the plain text key used
to encrypt the boot ima

drivers: caam: add DEK blob support

The CAAM can generate a specific key blob called DEK blob - Data
Encryption Key blob. It encapsulates and encrypts the plain text key used
to encrypt the boot image. This blob is decapsulated by the HAB - High
Assurance boot at boot to decrypt the boot image.

The DEK blob is a specific CAAM blob as it requires a header and the key
must be encapsulated from the CAAM secure memory.

Enable the CAAM DEK blob support on imx8m platforms.

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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