[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-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index a480b96..32b7af3 100644
--- a/arch/arm/mach-omap2/mailbox.c
+++ b/arch/arm/mach-omap2/mailbox.c
@@ -14,9 +14,9 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
+#include <linux/io.h>
 #include <mach/mailbox.h>
 #include <mach/irqs.h>
-#include <asm/io.h>
 
 #define MAILBOX_REVISION		0x00
 #define MAILBOX_SYSCONFIG		0x10