UBIFS: add more debugging messages for LPT

Also add debugging checks for LPT size and separate
out c->check_lpt_free from unrelated bitfields.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>

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

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

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

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

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