cifs: move definition of cifs_fattr earlier in cifsglob.h

This only moves these definitions to come earlier in the file
but not change the definition itself.
This is done to reduce the amount of changes in future patches.

Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>