Pick commit 654f2b9 from Linux
upstream.

    crypto: caam - allow retrieving 'era' from register

    The 'era' information can be retrieved from CAAM registers, so
    introduce a caam_get_era_from_hw() function that gets it via register
    reads in case the 'fsl,sec-era' property is not passed in the device
    tree.

    This function is based on the U-Boot implementation from
    drivers/crypto/fsl/sec.c

    Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
    Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
    Tested-by: Breno Lima <breno.lima@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>