ubifs-utils: Adapt lpt subsystem in libubifs

ubifs-utils: Adapt lpt subsystem in libubifs

Adapt lpt subsystem(lpt.c,lprops.c,lpt_commit.c) in libubifs, compared
with linux kernel implementations:
 1. Remove debug related functions(eg. dbg_chk_lpt_sz, dbg_chk_pnode),
    some of debug functions are not needed by fsck, because fsck will
    check fs in another way.
 2. Remove some functions(eg. ubifs_create_dflt_lpt) which won't be used
    in fsck/mkfs.
 3. Adapt do_calc_lpt_geom() to mkfs/fsck situations.
 4. Adapt calc_dflt_lpt_geom to support the mkfs tool, and export it.
 5. Adapt ubifs_create_lpt() according to create_lpt(mkfs), make sure that
    the height of created lpt is right.

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