AT91: change includes from asm/arch/io.h to asm/io.h

and remove the now unused asm/arch-at91/io.h

Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
index 1631687..be2a026 100644
--- a/drivers/gpio/at91_gpio.c
+++ b/drivers/gpio/at91_gpio.c
@@ -36,9 +36,9 @@
 
 #include <config.h>
 #include <common.h>
+#include <asm/io.h>
 #include <asm/sizes.h>
 #include <asm/arch/hardware.h>
-#include <asm/arch/io.h>
 #include <asm/arch/at91_pio.h>
 
 int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup)