Staging: speakup: fix speakup core to build properly

The vc_data structure changed to move the tty structure off to the port,
so change the code to handle this.  Now the code will build properly,
and hopefully work as well.

Cc: William Hubbs <w.d.hubbs@gmail.com>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>