Revert "PPC: pseries: Remove hack for PIO window"
This reverts commit a178274e. Contrary to that commit's message, the users of old_portio are not all gone. In particular VGA still uses it via portio_list_add(). Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NAlexander Graf <agraf@suse.de>
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