ide: add ide_host_add() helper

Add ide_host_add() helper which does ide_host_alloc()+ide_host_register(),
then convert ide_setup_pci_device[s](), ide_legacy_device_add() and some
host drivers to use it.

While at it:

* Fix ide_setup_pci_device[s](), ide_arm.c, gayle.c, ide-4drives.c,
  macide.c, q40ide.c, cmd640.c and cs5520.c to return correct error value.

* -ENOENT -> -ENOMEM in rapide.c, ide-h8300.c, ide-generic.c, au1xxx-ide.c
  and pmac.c

* -ENODEV -> -ENOMEM in palm_bk3710.c, ide_platform.c and delkin_cb.c

* -1 -> -ENOMEM in ide-pnp.c

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/legacy/buddha.c b/drivers/ide/legacy/buddha.c
index 2625667..7c2afa9 100644
--- a/drivers/ide/legacy/buddha.c
+++ b/drivers/ide/legacy/buddha.c
@@ -151,7 +151,6 @@
 static int __init buddha_init(void)
 {
 	struct zorro_dev *z = NULL;
-	struct ide_host *host;
 	u_long buddha_board = 0;
 	BuddhaType type;
 	int buddha_num_hwifs, i;
@@ -226,9 +225,7 @@
 			hws[i] = &hw[i];
 		}
 
-		host = ide_host_alloc(NULL, hws);
-		if (host)
-			ide_host_register(host, NULL, hws);
+		ide_host_add(NULL, hws, NULL);
 	}
 
 	return 0;