ARM: gpio: convert includes of mach/gpio.h and asm/gpio.h to linux/gpio.h

Convert arch/arm includes of mach/gpio.h and asm/gpio.h to linux/gpio.h
before we start consolidating the individual platform implementations
of the gpio header files.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index 2225042..224e9e2 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -11,6 +11,7 @@
 
 #include <linux/clk.h>
 #include <linux/errno.h>
+#include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/debugfs.h>
@@ -23,8 +24,6 @@
 #include <mach/hardware.h>
 #include <mach/at91_pio.h>
 
-#include <asm/gpio.h>
-
 #include "generic.h"
 
 struct at91_gpio_chip {