pps: client: use new parport device model

Modify pps client driver to use the new parallel port device model.
In that process, added an index to mention the device number when we
have more than one parallel port.

Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>