dm zoned: remove 'dev' argument from reclaim

Use the dmz_zone_to_dev() mapping function to remove the
'dev' argument from reclaim.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>