Revert "hugetlbfs: fix hugetlbfs_statfs() locking"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I9SZXR



--------------------------------

This reverts commit 6983a327.

The prior patches are not merged, this commit will leads to do heavy
things and even schedule with irq disabled. So revert it first.

Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>