caam: add BLOB module for MKVB retrieval

The BLOB module currently only implements the retrieval of the MKVB to
provide a HUK implementation for i.MX platforms. The
tee_otp_get_hw_unique_key() funct

caam: add BLOB module for MKVB retrieval

The BLOB module currently only implements the retrieval of the MKVB to
provide a HUK implementation for i.MX platforms. The
tee_otp_get_hw_unique_key() function is also implemented in this module
and caches the key, since it can't be generated again at runtime.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Acked-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Clement Faure <clement.faure@nxp.com>

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