ata: libata-eh: Add missing command name

Add the missing command name for ATA_CMD_NCQ_NON_DATA to
ata_get_cmd_name().

Fixes: 661ce1f0 ("libata/libsas: Define ATA_CMD_NCQ_NON_DATA")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>