staging: vt6655: remove typedef void *TimerFunction

Covert functions TimerSQ3CallBack and TimerState1CallBack to
the correct type for struct timer_list.function to remove
the cast altogether.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>