ide: remove chipset type fixup from ide_host_register()

* Set chipset type explicitly in tx4938ide and tx4939ide host drivers
  (all other host drivers were updated already).

* Remove no longer used chipset type fixup from ide_host_register().

Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/tx4938ide.c

@@ -226,6 +226,7 @@ static const struct ide_port_info tx4938ide_port_info __initdata = {
 #endif
 	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 	.pio_mask		= ATA_PIO5,
+	.chipset		= ide_generic,
 };
 
 static int __init tx4938ide_probe(struct platform_device *pdev)