ufs: don't touch mtime/ctime of directory being moved

See "ext2: Do not update mtime of a moved directory" (and followup in
"ext2: fix unbalanced kmap()/kunmap()") for background; this is UFS
equivalent - the same problem exists here.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/ufs/dir.c
Simple merge

diff --cc fs/ufs/namei.c
Simple merge

diff --cc fs/ufs/ufs.h
Simple merge