ata: pata_hpt3x2n: drop unused HPT_PCI_FAST

The driver has never used HPT_PCI_FAST -- drop it.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>