icside: use ec->dma directly

* hwif->hwif_data contains pointer to struct expansion_card so use ec->dma
  directly instead of caching it in hwif->hw.dma.

* Remove no longer needed hw_regs_t.dma and NO_DMA define.

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/legacy/ide_platform.c

@@ -51,7 +51,6 @@ static ide_hwif_t *__devinit plat_ide_locate_hwif(void __iomem *base,
 	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 	hwif->hw.irq = hwif->irq = irq;
 
-	hwif->hw.dma = NO_DMA;
 	hwif->chipset = hwif->hw.chipset = ide_generic;
 
 	if (mmio) {