erofs: support dot-omitted directories

There's no need to record "." dirents in the directory data (while
they could be used for sanity checks, they aren't very useful.)
Omitting "." dirents also improves directory data deduplication.

Use a per-inode (instead of per-sb) flag to indicate if the "." dirent
is omitted or not, ensuring compatibility with incremental builds.  It
also reuses EROFS_I_NLINK_1_BIT, as it has very limited use cases for
directories with `nlink = 1`.

Emit the "." entry as the last virtual dirent in the directory because
it is _much_ less frequently used than the ".." dirent.  It also keeps
`f_pos` meaningful, as it strictly follows the directory data when it's
less than i_size.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20250310095459.2620647-6-hsiangkao@linux.alibaba.com