ARM: orion: move custom gpio functions to orion-gpio.h

Move custom orion platforms gpio code to orion-gpio to remove the
dependency on mach/gpio.h.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>

arch/arm/mach-orion5x/net2big-setup.c

@@ -25,6 +25,7 @@
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <mach/orion5x.h>
+#include <plat/orion-gpio.h>
 #include "common.h"
 #include "mpp.h"