Here is solution, split in arrays:
<?php
foreach (array_chunk(get_terms( 'razotajs', 'orderby=count&order=DESC&hide_empty=0&parent=0' ), 6, true) as $array)
{
echo '<div class="logo_sets">';
foreach($array as $cat)
{ ?>
<a href="https://wordpress.stackexchange.com/questions/224950/<?php echo get_term_link($cat->slug,"razotajs'); ?>" title="<?php echo $cat->name; ?>"><img src="<?php echo z_taxonomy_image_url($cat->term_id); ?>" alt="<?php echo $cat->name; ?>" /></a>
<?php }
echo '</div>';
}
?>