ide: add ide_device_add()

* Add ide_device_add() helper and convert host drivers to use it
  instead of open-coded variants.

* Make ide_pci_setup_ports() and do_ide_setup_pci_device()
  take 'u8 *idx' argument instead of 'ata_index_t *index'.

* Remove no longer needed ata_index_t.

* Unexport probe_hwif_init() and make it static.

* Unexport ide_proc_register_port().

There should be no functionality changes caused by this patch
(sgiioc4.c: ide_proc_register_port() requires hwif->present
 to be set and it won't be set if probe_hwif_init() fails).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c
index 2e5a9cc..7f0d433 100644
--- a/drivers/ide/legacy/ht6560b.c
+++ b/drivers/ide/legacy/ht6560b.c
@@ -311,6 +311,7 @@
 int __init ht6560b_init(void)
 {
 	ide_hwif_t *hwif, *mate;
+	static u8 idx[4] = { 0, 1, 0xff, 0xff };
 	int t;
 
 	if (probe_ht6560b == 0)
@@ -359,11 +360,7 @@
 	mate->drives[0].drive_data = t;
 	mate->drives[1].drive_data = t;
 
-	probe_hwif_init(hwif);
-	probe_hwif_init(mate);
-
-	ide_proc_register_port(hwif);
-	ide_proc_register_port(mate);
+	ide_device_add(idx);
 
 	return 0;