ide: add ->chipset field to ide_pci_device_t

Add ->chipset field to ide_pci_device_t and use it in ide_hwif_configure()
to set hwif->chipset.  Convert cmd64x, cy82c693, rz1000 and trm290 host
drivers to use this new ability.

While at it define hwif_chipset_t as u8 to save some space in hw_regs_t,
ide_hwif_t and ide_pci_device_t instances.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
index 6903100..30c0741 100644
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -397,7 +397,7 @@
 		memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
 		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 	}
-	hwif->chipset = ide_pci;
+	hwif->chipset = d->chipset ? d->chipset : ide_pci;
 	hwif->pci_dev = dev;
 	hwif->cds = (struct ide_pci_device_s *) d;
 	hwif->channel = port;