Add missing ATA_ID_* defines and update {ata,atapi}_*()
inlines accordingly.  The currently unused defines are
needed for the forthcoming drivers/ide/ changes.

v2:
Add ATA_ID_SPG.
Acked-by: NJeff Garzik <jgarzik@pobox.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>