MX: Set a common gpio.h for all i.MX

Each i.MX has its own gpio.h, defining the same structure.
The internal GPIO controller has the same layout
(at least for the register used by u-boot) and can be shared.

Signed-off-by: Stefano Babic <sbabic@denx.de>
Tested-by: Matt Sealey <matt@genesi-usa.com>
diff --git a/arch/arm/include/asm/arch-mx5/gpio.h b/arch/arm/include/asm/arch-mx5/gpio.h
index 1dc34e9..b1b1218 100644
--- a/arch/arm/include/asm/arch-mx5/gpio.h
+++ b/arch/arm/include/asm/arch-mx5/gpio.h
@@ -25,11 +25,6 @@
 #ifndef __ASM_ARCH_MX5_GPIO_H
 #define __ASM_ARCH_MX5_GPIO_H
 
-/* GPIO registers */
-struct gpio_regs {
-	u32	gpio_dr;
-	u32	gpio_dir;
-	u32	gpio_psr;
-};
+#include <asm/imx-common/gpio.h>
 
 #endif