ide: remove chipset field from hw_regs_t

* Convert host drivers that still use hw_regs_t's chipset field to use
  the one in struct ide_port_info instead.

* Move special handling of ide_pci chipset type from ide_hw_configure()
  to ide_init_port().

* Remove chipset field from hw_regs_t.

While at it:
- remove stale comment in delkin_cb.c

There should be no functional changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-4drives.c

@@ -25,6 +25,7 @@ static const struct ide_port_info ide_4drives_port_info = {
 	.port_ops		= &ide_4drives_port_ops,
 	.host_flags		= IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA |
 				  IDE_HFLAG_4DRIVES,
+	.chipset		= ide_4drives,
 };
 
 static int __init ide_4drives_init(void)
@@ -52,7 +53,6 @@ static int __init ide_4drives_init(void)
 
 	ide_std_init_ports(&hw, base, ctl);
 	hw.irq = 14;
-	hw.chipset = ide_4drives;
 
 	return ide_host_add(&ide_4drives_port_info, hws, NULL);
 }