Fix <io.h> includes

These resolved to <device/oprom/include/io.h> which
included <arch/io.h> that we really wanted.

Change-Id: I9aa0bdf34cd1d53e20b4494c7986f0878f4fd840
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31693
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/amd/agesa/hudson/smbus.c b/src/southbridge/amd/agesa/hudson/smbus.c
index 33bc917..783c324 100644
--- a/src/southbridge/amd/agesa/hudson/smbus.c
+++ b/src/southbridge/amd/agesa/hudson/smbus.c
@@ -16,7 +16,7 @@
 #ifndef _HUDSON_SMBUS_C_
 #define _HUDSON_SMBUS_C_
 
-#include <io.h>
+#include <arch/io.h>
 #include <stdint.h>
 #include "smbus.h"