affs: Drop support for metadata bh tracking

affs: Drop support for metadata bh tracking

AFFS did all the hard work of tracking metadata bhs dirtied for an inode
but it actually never used this information as affs_file_fsync() just
calls sync_blockdev() to writeback all filesystem metadata bhs. After a
discussion with AFFS maintainer nobody cares about AFFS performance
so let's keep this affs_file_fsync() behavior and just drop all the
pointless tracking from AFFS.

CC: David Sterba <dsterba@suse.com>
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260727104923.3828017-21-jack@suse.cz
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>