piix has been kept around because it has 2 device IDs not listed in
other drivers:
PCI_DEVICE_ID_INTEL_82371FB_0 == 0x122e (PIIX function 0)
This function is the ISA bridge, not a PATA controller!
PCI_DEVICE_ID_INTEL_82801DB_1 == 0x24c1 (ICH4-L function 1)
This should be functionally identical to the ICH4's PATA
controller.
Add the latter device ID to ata_piix and disable piix (except on
alpha, which has not been converted to use libata).
svn path=/dists/trunk/linux-2.6/; revision=16427