Remove deprecated function views_get_all_views

Remove deprecated function views_get_all_views

/**
 * Returns an array of all views as fully loaded $view objects.
 *
 * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
 *   Use \Drupal\views\Views::getAllViews().
 */
function views_get_all_views() {
  return Views::getAllViews();
}