redhat/configs: automotive: disable CONFIG_MD

CONFIG_MD=y has no effect in automotive; the subsystem's Makefile doesn't have any obj-y additions, and the only Kconfigs enabled in automotive that are used in the subsystem's Makefile are:

    $ git grep -Pho '\$\(CONFIG_[^)]+\)' drivers/md/Makefile |
            sort -u |
            tr -d '$()' |
            xargs -I{} grep -F "{}=" redhat/configs/kernel-*-automotive*.config
    redhat/configs/kernel-7.2.0-aarch64-automotive.config:CONFIG_BLK_DEV_ZONED=y
    redhat/configs/kernel-7.2.0-aarch64-automotive-debug.config:CONFIG_BLK_DEV_ZONED=y
    redhat/configs/kernel-7.2.0-x86_64-automotive.config:CONFIG_BLK_DEV_ZONED=y
    redhat/configs/kernel-7.2.0-x86_64-automotive-debug.config:CONFIG_BLK_DEV_ZONED=y
    redhat/configs/kernel-7.2.0-aarch64-automotive.config:CONFIG_IMA=y
    redhat/configs/kernel-7.2.0-aarch64-automotive-debug.config:CONFIG_IMA=y
    redhat/configs/kernel-7.2.0-x86_64-automotive.config:CONFIG_IMA=y
    redhat/configs/kernel-7.2.0-x86_64-automotive-debug.config:CONFIG_IMA=y

These Kconfigs are only used to modify dm-mod.o, which isn't built in automotive kernels since it depends on CONFIG_BLK_DEV_DM.

CONFIG_MD is also the only MD-related Kconfig that's enabled in automotive:

    $ grep -P 'CONFIG_(.+_)?MD[_=]' redhat/configs/kernel-*-automotive*.config
    redhat/configs/kernel-6.12.0-aarch64-automotive.config:CONFIG_MD=y
    redhat/configs/kernel-6.12.0-aarch64-automotive-debug.config:CONFIG_MD=y
    redhat/configs/kernel-6.12.0-x86_64-automotive.config:CONFIG_MD=y
    redhat/configs/kernel-6.12.0-x86_64-automotive-debug.config:CONFIG_MD=y

Since the Kconfig is essentially a no-op, disable it in automotive kernels.

Downstream CS10 MR: redhat/centos-stream/src/kernel/centos-stream-10!3256 (merged)

Signed-off-by: Jared Kangas jkangas@redhat.com