[ARM] Convert asm/io.h to linux/io.h

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
index f74a460..d816c51 100644
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ b/arch/arm/mach-ixp4xx/common-pci.c
@@ -25,10 +25,10 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/io.h>
 #include <asm/dma-mapping.h>
 
 #include <asm/cputype.h>
-#include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/sizes.h>
 #include <asm/system.h>