Pick commit 4ca7c7d from Linux
upstream.

    crypto: caam - trivial code clean-up

    -replace offsetof with container_of
    -remove unused "assoc_nents", "iv_dma" from aead_edesc
    and fix comments
    -remove unused CAAM_MAX_IV_LENGTH #define

    Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>