ata: pata_parport-bpck6: remove parallel port bit defines

Remove port_stb, port_afd, cmd_stb, port_init, data_stb and port_sel
defines and use standard PARPORT_CONTROL_* instead.

Signed-off-by: Ondrej Zary <linux@zary.sk>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>