ide: remove drive->driveid

* Factor out HDIO_[OBSOLETE,GET]_IDENTITY ioctls handling
  to ide_get_identity_ioctl().

* Use temporary buffer in ide_get_identity_ioctl() instead
  of accessing drive->id directly.

* Add ide_id_to_hd_driveid() inline to convert raw id into
  struct hd_driveid format (needed on big-endian).

* Use ide_id_to_hd_driveid() in ide_get_identity_ioctl(),
  cleanup ide_fix_driveid() and switch ide to use use raw id.

* Remove no longer needed drive->driveid.

  This leaves us with 3 users of struct hd_driveid in tree:
  - arch/um/drivers/ubd_kern.c
  - drivers/block/xsysace.c
  - drivers/usb/storage/isd200.c

While at it:

* Use ata_id_u{32,64}() and ata_id_has_{dma,lba,iordy}() macros.

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-timings.c b/drivers/ide/ide-timings.c
index d64f345..96e3d46 100644
--- a/drivers/ide/ide-timings.c
+++ b/drivers/ide/ide-timings.c
@@ -83,7 +83,7 @@
 	u16 cycle = 0;
 
 	if (id[ATA_ID_FIELD_VALID] & 2) {
-		if (drive->driveid->capability & 8)
+		if (ata_id_has_iordy(drive->id))
 			cycle = id[ATA_ID_EIDE_PIO_IORDY];
 		else
 			cycle = id[ATA_ID_EIDE_PIO];