- initialize it properly in the bus front-ends (all 2, exept in wdc_pcmcia.c
for the "Sandisk CompactFlash Card" where it's set to 1)
- remplace hardcoded '2' by ata_channel->ch_ndrive in MI IDE drivers.
From Christos Zoulas in kern/32501.
I/O processor and the i31244 PCI-X S-ATA controller.
The IQ31244 is almost identical to the IQ80321, from software's
perspective, so we share much of the code.
