Add a tiny TODO comment about duplicated code.

/**

 * Helper class to listen for some magic character sequences

 * that are handled specially by the dialer.

 *

 * TODO: there's lots of duplicated code between this class and the

 * corresponding class under apps/Phone.  Let's figure out a way to

 * unify these two classes (in the framework? in a common shared library?)

 */

public class SpecialCharSequenceMgr {

    private static final String TAG = "SpecialCharSequenceMgr";