<?php
$wp_customize->add_section('social', array(
      'title' => __('Social Media','bordered'),
      'priority' => 2,
      'panel' => 'panel_bordered'

));

$wp_customize->add_setting( 'social_icons', array(
  'sanitize_callback' => 'customizer_repeater_sanitize'
));
$wp_customize->add_control( new Customizer_Repeater( $wp_customize, 'social_icons', array(
  'label'   => esc_html__('Social Media Item','bordered'),
  'section' => 'social',
  'priority' => 1,
  'customizer_repeater_image_control' => false,
  'customizer_repeater_icon_control' => true,
  'customizer_repeater_title_control' => false,
  'customizer_repeater_subtitle_control' => false,
  'customizer_repeater_text_control' => false,
  'customizer_repeater_link_control' => true,
  'customizer_repeater_shortcode_control' => false,
  'customizer_repeater_repeater_control' => false
) ) );

$wp_customize->selective_refresh->add_partial( 'social_icons', array(
  'selector' => '.social', 
) );

?>