UBIFS: separate debugging fields out

Introduce a new data structure which contains all debugging
stuff inside. This is cleaner than having debugging stuff
directly in 'c'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --cc fs/ubifs/commit.c
Simple merge

diff --cc fs/ubifs/debug.c
Simple merge

diff --cc fs/ubifs/debug.h
Simple merge

diff --cc fs/ubifs/lprops.c
Simple merge

diff --cc fs/ubifs/lpt_commit.c
Simple merge

diff --cc fs/ubifs/orphan.c
Simple merge

diff --cc fs/ubifs/super.c
Simple merge

diff --cc fs/ubifs/tnc_commit.c
Simple merge

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