parisc: disable CONFIG_IDE in defconfigs

Enable libata support for the Nat Semi NS87415 controller, and
disable the soon to be removed legacy ide driver entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Helge Deller <deller@gmx.de>