hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6T6VY
CVE: NA

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Struct mddev is just used inside raid, just in case that md_mod is compiled
from new kernel, and raid1/raid10 or other out-of-tree raid are compiled
from old kernel.
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>