ide: add IDE_HFLAG_NO_ATAPI_DMA host flag

Add IDE_HFLAG_NO_ATAPI_DMA host flag and set it in host drivers which
don't support ATAPI DMA.  Then remove no longer needed hwif->atapi_dma.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index 44ac0e2..9709681 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -155,6 +155,7 @@
 	.autodma	= NOAUTODMA,
 	.bootable	= NEVER_BOARD,
 	.extra		= 16,
+	.host_flags	= IDE_HFLAG_NO_ATAPI_DMA,
 	.pio_mask	= ATA_PIO5,
 };