HAMBURG (Reuters) – Volkswagen is weighing issuing an equal number of common and preference shares in a potential listing of luxury carmaker Porsche AG and may pay a special dividend to its owners to get support for such a move, two people familiar with the matter said. Volkswagen may seek to list 25% in Porsche AG if it decides in favour of an initial public offering (IPO), the people said, adding no agreement has been reached and details of a final deal could still vary. Volkswagen and Porsche SE earlier confirmed they were in talks about a potential listing of the iconic carmaker, which cou…