ARM: lpc32xx: delete local <mach/gpio.h> header

This header is not used by anything, and since the arch does
not specify NEED_MACH_GPIO_H it is not included into
<linux/gpio.h> either. Delete it.
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-lpc32xx/include/mach/gpio.h

-#ifndef __MACH_GPIO_H
-#define __MACH_GPIO_H
-
-#include "gpio-lpc32xx.h"
-
-#endif /* __MACH_GPIO_H */