[GFS2] Move gfs2_meta_syncfs() into log.c

By moving gfs2_meta_syncfs() into log.c, gfs2_ail1_start()
can be made static.

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

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

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

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

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