ata: pata_parport-bpck6: Remove dependency on 64BIT

There is no reason to have compilation of the bpck6 protocol module
being dependent on 64BIT. Remove this dependency.

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