[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/plat-omap/mux.c b/arch/arm/plat-omap/mux.c
index 847df20..80b040f 100644
--- a/arch/arm/plat-omap/mux.c
+++ b/arch/arm/plat-omap/mux.c
@@ -25,8 +25,8 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/io.h>
 #include <asm/system.h>
-#include <asm/io.h>
 #include <linux/spinlock.h>
 #include <mach/mux.h>