PCI: correct flag name

RESOURCE_IO does not exist.  Rename to IORESOURCE_IO.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

Link: https://lore.kernel.org/r/1595778455-12132-1-git-send-email-Julia.Lawall@inria.fr


Signed-off-by: Jonathan Corbet <corbet@lwn.net>