Revert "ext4: Protect superblock modifications with a buffer lock"

hulk inclusion
category: bugfix
bugzilla: 46758
CVE: NA

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This reverts commit eed1f8e19630ff89b2d877b660cda03bef92e85b.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>