Add new trace functions for ZBC_IN and ZBC_OUT.
Reviewed-by: NDoug Gilbert <dgilbert@interlog.com>
Reviewed-by: NEwan D. Milne <emilne@redhat.com>
Signed-off-by: NHannes Reinecke <hare@suse.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>