fsck.ubifs: rebuild_fs: Extract reachable directory entries tree

This is the 5/12 step of rebuilding. Extract reachable directory entries
tree. Make sure that all files can be searched from '/', unreachable
file is deleted. So, all files can be accessible in userspace after
reparing.

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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