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-dove/mpp.c

@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <plat/mpp.h>
 #include <mach/dove.h>
+#include <plat/orion-gpio.h>
 #include "mpp.h"
 
 struct dove_mpp_grp {