Display post from custom post type

I have this Custom Post Type (CPT) defined at functions.php:

register_post_type(
        'opinion',
        array(
            'label'              => __( 'Opiniones' ),
            'singular_label'     => __( 'Opinión' ),
            'labels'             => $labels,
            'public'             => true,
            'publicly_queryable' => true,
            'show_ui'            => true,
            'menu_position'      => 2,
            'hierarchical'       => false,
            'rewrite'            => array( 'slug' => 'opinion', 'with_front' => true ),
            'has_archive'        => true,
            'query_var'          => true,
            'supports'           => array( 'title', 'editor', 'excerpt', 'thumbnail', 'author' ),
            'capability_type'    => 'opiniones',
            'capabilities'       => array(
                'publish_posts'       => 'publish_opiniones',
                'edit_posts'          => 'edit_opiniones',
                'edit_others_posts'   => 'edit_others_opiniones',
                'delete_posts'        => 'delete_opiniones',
                'delete_others_posts' => 'delete_others_opiniones',
                'read_private_posts'  => 'read_private_opiniones',
                'edit_post'           => 'edit_opinion',
                'delete_post'         => 'delete_opinion',
                'read_post'           => 'read_opinion',
            )
        )
    );

And have this code at front-page.php:

<?php
    $prev_post_ids = array();
    $prepost       = $post;
    $normal_args   = array(
        'ignore_sticky_posts' => 1,
        'order'               => 'desc',
        'meta_query'          => array(
            array(
                'key'     => '_custom_blog_enhome',
                'value'   => '1',
                'compare' => '='
            )
        ),
        'post_status'         => 'publish',
        'posts_per_page'      => 6
    );

    $normal_query  = new WP_Query( $normal_args );

    if ($normal_query->have_posts()) {
        while ($normal_query->have_posts()) {
            $normal_query->the_post();
            $prev_post_ids[] = $post->ID; ?>
            <?php $field = 'custom_blog_exclusivo';
            if ( ! ($$field = get_post_meta( $post->ID, '_'.$field, true ))) {
                $$field = "";
            } ?>

            // here goes the HTML markup for display the post not relevant here

        <?php }
    }
    $post = $prepost;
    wp_reset_postdata(); ?>

But CPT from slug=opinion aren’t show. What I need to change in order to display them on front-page.php?

__Performing test__

I’m doing some test and my code now looks as follow:

$prev_post_ids = array();
    $prepost       = $post;
    $normal_args   = array(
        'ignore_sticky_posts' => 1,
        'order'               => 'desc',
        'meta_query'          => array(
            array(
                'key'     => '_custom_blog_enhome',
                'value'   => '1',
                'compare' => '='
            )
        ),
        'post_status'         => 'publish',
        'posts_per_page'      => 6,
        'post_type'           => array('opinion','especiales','clasificados','portadadeldia','anunciantes','post','pages')
    );

    $normal_query  = new WP_Query( $normal_args )

But still not showing posts from opinion, why? Any advice?