ide: add IDE_HFLAG_{IO_32BIT,UNMASK_IRQS} host flags

Add IDE_HFLAG_{IO_32BIT,UNMASK_IRQS} host flag to tell ide_pci_setup_ports()
to set drive->{io_32bit,unmask} for both drives on the interface.  Convert
amd74xx, sl82c105 and via82cxxx host drivers to use these new host flags.

While at it:

* Add IDE_HFLAGS_AMD define (amd74xx host driver).

* Add IDE_HFLAGS_VIA define (via82cxxx host driver).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
index a1d7efc..d62b225 100644
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -573,6 +573,16 @@
 		if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
 			hwif->mate->serialized = hwif->serialized = 1;
 
+		if (d->host_flags & IDE_HFLAG_IO_32BIT) {
+			hwif->drives[0].io_32bit = 1;
+			hwif->drives[1].io_32bit = 1;
+		}
+
+		if (d->host_flags & IDE_HFLAG_UNMASK_IRQS) {
+			hwif->drives[0].unmask = 1;
+			hwif->drives[1].unmask = 1;
+		}
+
 		if (hwif->dma_base) {
 			hwif->swdma_mask = d->swdma_mask;
 			hwif->mwdma_mask = d->mwdma_mask;