[libata ahci] minor fixes

Add support for ioctl handling.
Remove incorrect comment.

drivers/scsi/ahci.c

@@ -184,6 +184,7 @@ static inline int ahci_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
 static Scsi_Host_Template ahci_sht = {
 	.module			= THIS_MODULE,
 	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
 	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
@@ -944,10 +945,6 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (!printed_version++)
 		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 
-	/*
-	 * If this driver happens to only be useful on Apple's K2, then
-	 * we should check that here as it has a normal Serverworks ID
-	 */
 	rc = pci_enable_device(pdev);
 	if (rc)
 		return rc;