ARM: gpio: at91: remove redundant include of mach/gpio.h

asm/gpio.h already directly includes mach/gpio.h.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91/gpio.c

@@ -22,7 +22,6 @@
 
 #include <mach/hardware.h>
 #include <mach/at91_pio.h>
-#include <mach/gpio.h>
 
 #include <asm/gpio.h>