ARM: kill CONFIG_NEED_MACH_GPIO_H

The long pain of maintaining the legacy <mach/gpio.h> include
ladder is now gone with S5P as the last user being deleted. Cut
this Kconfig option and remove the inclusion directive in
<asm/gpio.h> for good.
Acked-by: NAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/Kconfig

@@ -239,13 +239,6 @@ config ARM_PATCH_PHYS_VIRT
 	  this feature (eg, building a kernel for a single machine) and
 	  you need to shrink the kernel to the minimal size.
 
-config NEED_MACH_GPIO_H
-	bool
-	help
-	  Select this when mach/gpio.h is required to provide special
-	  definitions for this platform. The need for mach/gpio.h should
-	  be avoided when possible.
-
 config NEED_MACH_IO_H
 	bool
 	help

arch/arm/include/asm/gpio.h

@@ -5,11 +5,6 @@
 #define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO
 #endif
 
-/* not all ARM platforms necessarily support this API ... */
-#ifdef CONFIG_NEED_MACH_GPIO_H
-#include <mach/gpio.h>
-#endif
-
 #ifndef __ARM_GPIOLIB_COMPLEX
 /* Note: this may rely upon the value of ARCH_NR_GPIOS set in mach/gpio.h */
 #include <asm-generic/gpio.h>