ocfs2: limit cluster bitmap information saved at mount

We were storing cluster count on the ocfs2_super structure, but never
actually using it so remove that. Also, we don't want to populate the
uptodate cache with the unlocked block read - it is technically safe as is,
but we should change it for correctness.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --cc fs/ocfs2/ocfs2.h
Simple merge

diff --cc fs/ocfs2/super.c
Simple merge