ide: add IDE_HFLAG_BOOTABLE host flag

Add IDE_HFLAG_BOOTABLE host flag and IDE_HFLAG_OFF_BOARD define.  Convert
all host drivers using ide_pci_device_t to use IDE_HFLAG_{BOOTABLE,OFF_BOARD}
instead of d->bootable and then remove no longer needed d->bootable.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/cs5530.c

@@ -275,9 +275,8 @@ static ide_pci_device_t cs5530_chipset __devinitdata = {
 	.init_chipset	= init_chipset_cs5530,
 	.init_hwif	= init_hwif_cs5530,
 	.autodma	= AUTODMA,
-	.bootable	= ON_BOARD,
+	.host_flags	= IDE_HFLAG_POST_SET_MODE | IDE_HFLAG_BOOTABLE,
 	.pio_mask	= ATA_PIO4,
-	.host_flags	= IDE_HFLAG_POST_SET_MODE,
 };
 
 static int __devinit cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)