ata: pata_parport: fix EPAT C7/C8 Kconfig

CONFIG_PARIDE_EPATC8 was renamed to CONFIG_PATA_PARPORT_EPATC8 but
epat.c was not updated to reflect that. Update it.

Reported-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Ondrej Zary <linux@zary.sk>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>