ksmbd: adapt vfs api to 5.10

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I60T7G


CVE: NA

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These vfs apis have not supported user namespace in 5.10, so we need to
adapt these apis to remove all user namespace parameters.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>