GFS2: Move gfs2_icbit_munge into quota.c

This function is only called twice, and both callers are
quota related, so lets move this function into quota.c and
make it static.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --cc fs/gfs2/quota.c
Simple merge

diff --cc fs/gfs2/util.c
Simple merge

diff --cc fs/gfs2/util.h
Simple merge