This code will replace the standard HTML list bullets and with any Divi icon. Place code in style.css file in your child theme directory.

Replace List Bullets with Divi Icons

.custom_bullets ul {
    padding-bottom: 20px;
}

.custom_bullets li { 
    padding-left: 15px;
    padding-bottom: 0em;
    list-style-type: none;
}

.custom_bullets li::before {
    font-family: 'ETmodules';
    content: "\45";
    color: #0C71C3;
    position: absolute;
    left: 5px;
}