ARM: at91: Remove hardware.h included in configs

As said in READRE.kconfig, include/configs/*.h will be removed
after all options are switched to Kconfig. As the first step,
remove the follow line from include/configs/*.h.

 #include <asm/hardware.h>

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 38c435e..81f30ea 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <dm.h>
 #include <dm/pinctrl.h>
+#include <asm/hardware.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <mach/at91_pio.h>