md: use ATTRIBUTE_GROUPS() for md default sysfs attributes
Replace the md_default_group and md_attr_groups with
ATTRIBUTE_GROUPS().
Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
Link: https://lore.kernel.org/linux-raid/20260423101303.48196-4-abd.masalkhi@gmail.com
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
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