linux-yocto/6.12: config: add pmem to genericarm64

linux-yocto/6.12: config: add pmem to genericarm64

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

1/1 [
    Author: Mikko Rapeli
    Email: mikko.rapeli@linaro.org
    Subject: genericarm64: add pmem feature and enable on genericarm64
    Date: Fri, 14 Mar 2025 11:48:34 +0200

    PMEM enables firmware to provide large memory block devices
    to the kernel. The firmware can download e.g. installer
    rootfs images to memory which kernel can then boot into.

    u-boot support has been added in
    https://lore.kernel.org/u-boot/20241203163605.1482152-2-sughosh.ganu@linaro.org/

    Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
    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>