au1xxx-ide: don't use hwif->hwif_data

* Use &auide_hwif directly instead of using hwif->hwif_data.

While at it:

* No need to initialize hwif->{select,config}_data.

There should be no functional changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>