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

Documentation/filesystems/sysfs-pci.rst

@@ -63,7 +63,7 @@ files, each with their own function.
   binary - file contains binary data
   cpumask - file contains a cpumask type
 
-.. [1] rw for RESOURCE_IO (I/O port) regions only
+.. [1] rw for IORESOURCE_IO (I/O port) regions only
 
 The read only files are informational, writes to them will be ignored, with
 the exception of the 'rom' file.  Writable files can be used to perform