staging: speakup: remove support for lp*

Testing has shown that lp* devices don't work correctly with speakup
just yet. That will require some additional work. Until then, this patch
removes code related to that.

Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>