MIPS: AR7: Fix double ar7_gpio_init declaration

Signed-off-by: Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1748/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-ar7/ar7.h

@@ -202,6 +202,4 @@ static inline void ar7_device_off(u32 bit)
 
 int __init ar7_gpio_init(void);
 
-int __init ar7_gpio_init(void);
-
 #endif /* __AR7_H__ */