wp_editor in add_meta_boxes does not show gallery

Make sure tinymce option has a valid value.
Remove it or set it to true if you don’t pass any parameters to tinymce

$editor_config = array(
    'teeny'=>true,
    'textarea_rows'=>10, 
    'editor_class'=>'csec_text', 
    'textarea_name'=>'csec_body', 
    'wpautop'=>false, 
    'tinymce'=>$tinymce_options //THIS OPTION SHOULD BE VALID
);

Edit:

Made a small research. Add wpview in plugins argument of tinymce options.

$tinymce_options = array(
    'plugins' => "wpview,lists,link,textcolor,hr",
    //all other options
}

Also, there is no tinymce table plugin.
List of available plugins:

'charmap',
'colorpicker',
'hr',
'lists',
'media',
'paste',
'tabfocus',
'textcolor',
'fullscreen',
'wordpress',
'wpautoresize',
'wpeditimage',
'wpemoji',
'wpgallery',
'wplink',
'wpdialogs',
'wptextpattern',
'wpview',