linux-yocto/6.5: cfg: restore CONFIG_DEVMEM

linux-yocto/6.5: cfg: restore CONFIG_DEVMEM

Integrating the following commit(s) to linux-yocto/.:

1/1 [
    Author: C. Andy Martin
    Email: cam@myfastmail.com
    Subject: security.cfg: restore strict-only /dev/mem access
    Date: Fri, 27 Oct 2023 11:22:06 -0400

    CONFIG_DEVMEM was mistakenly not enabled, which defeats
    CONFIG_STRICT_DEVMEM and friends, as it completely removes all
    /dev/mem support.

    Signed-off-by: C. Andy Martin <cam@myfastmail.com>
    Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>