ext4: move ext4_fill_raw_inode() related functions before __ext4_get_inode_loc()

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I476C7


CVE: NA
---------------------------

In preparation for calling ext4_fill_raw_inode() in __ext4_get_inode_loc(),
move three related functions before __ext4_get_inode_loc(), no logical
change.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Reviewed-by: Xie Miao <miaoxie@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>