xfs: remove the icdinode di_uid/di_gid members

mainline inclusion
from mainline-v5.6-rc4
commit 54295159
category: bugfix
bugzilla: 185881
CVE: CVE-2021-4037

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=542951592c99ff7b15c050954c051dd6dd6c0f97



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Use the Linux inode i_uid/i_gid members everywhere and just convert
from/to the scalar value when reading or writing the on-disk inode.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

conficts:
fs/xfs/libxfs/xfs_inode_buf.c
fs/xfs/libxfs/xfs_inode_buf.h
fs/xfs/xfs_inode_item.c
fs/xfs/xfs_iops.c

Signed-off-by: Guo Xuenan <guoxuenan@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>