[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-at91/clock.c b/arch/arm/mach-at91/clock.c
index f5c2847..e434510 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -22,8 +22,7 @@
 #include <linux/spinlock.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
-
-#include <asm/io.h>
+#include <linux/io.h>
 
 #include <mach/hardware.h>
 #include <mach/at91_pmc.h>