From: Grant Grundler <grundler@parisc-linux.org>
(minor changes by me - bart)

Move Superio (NatSem 87560) IDE hacks into the ns87415 driver
instead of exporting IDE data structures.

To date, only PA-RISC port is known to use the 87560 chip.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>