[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-ixp2000/ixdp2400.c b/arch/arm/mach-ixp2000/ixdp2400.c
index c673b9e..4467c42 100644
--- a/arch/arm/mach-ixp2000/ixdp2400.c
+++ b/arch/arm/mach-ixp2000/ixdp2400.c
@@ -25,8 +25,8 @@
 #include <linux/ioport.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/io.h>
 
-#include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/pgtable.h>
 #include <asm/page.h>