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>
diff --git a/drivers/ide/pci/trm290.c b/drivers/ide/pci/trm290.c
index 1307454..ad39202 100644
--- a/drivers/ide/pci/trm290.c
+++ b/drivers/ide/pci/trm290.c
@@ -325,12 +325,11 @@
 	.name		= "TRM290",
 	.init_hwif	= init_hwif_trm290,
 	.autodma	= NOAUTODMA,
-	.bootable	= ON_BOARD,
+	.host_flags	= IDE_HFLAG_NO_ATAPI_DMA |
 #if 0 /* play it safe for now */
-	.host_flags	= IDE_HFLAG_TRUST_BIOS_FOR_DMA | IDE_HFLAG_NO_ATAPI_DMA,
-#else
-	.host_flags	= IDE_HFLAG_NO_ATAPI_DMA,
+			  IDE_HFLAG_TRUST_BIOS_FOR_DMA |
 #endif
+			  IDE_HFLAG_BOOTABLE,
 };
 
 static int __devinit trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id)