xfs: rename xfs_inode_walk functions to xfs_icwalk

mainline-inclusion
from mainline-v5.13-rc4
commit c1115c0c
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4KIAO
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1115c0cba2b82e71ec77e794c684ac87160fcf6



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

Shorten the prefix so that all the incore inode cache walk code has
"xfs_icwalk" in the name somewhere.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Lihong Kou <koulihong@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>