ide: add struct ide_io_ports (take 3)

* Add struct ide_io_ports and use it instead of `unsigned long io_ports[]`
  in ide_hwif_t.

* Rename io_ports[] in hw_regs_t to io_ports_array[].

* Use un-named union for 'unsigned long io_ports_array[]' and 'struct
  ide_io_ports io_ports' in hw_regs_t.

* Remove IDE_*_OFFSET defines.

v2:
* scc_pata.c build fix from Stephen Rothwell.

v3:
* Fix ctl_adrr typo in Sparc-specific part of ns87415.c.
  (Noticed by Andrew Morton)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/arm/bast-ide.c b/drivers/ide/arm/bast-ide.c
index df09f03..713cef2 100644
--- a/drivers/ide/arm/bast-ide.c
+++ b/drivers/ide/arm/bast-ide.c
@@ -35,12 +35,12 @@
 	base += BAST_IDE_CS;
 	aux  += BAST_IDE_CS;
 
-	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
-		hw.io_ports[i] = (unsigned long)base;
+	for (i = 0; i <= 7; i++) {
+		hw.io_ports_array[i] = (unsigned long)base;
 		base += 0x20;
 	}
 
-	hw.io_ports[IDE_CONTROL_OFFSET] = aux + (6 * 0x20);
+	hw.io_ports.ctl_addr = aux + (6 * 0x20);
 	hw.irq = irq;
 
 	hwif = ide_find_port();