move 'ar71xx_add_device_usb' definition into devices.h

SVN-Revision: 14680

target/linux/ar71xx/files/arch/mips/ar71xx/devices.h

@@ -40,6 +40,8 @@ void ar71xx_add_device_gpio_buttons(int id,
 				    unsigned nbuttons,
 				    struct gpio_button *buttons) __init;
 
+void ar71xx_add_device_usb(void) __init;
+
 #ifdef CONFIG_AR71XX_EARLY_SERIAL
 static inline void ar71xx_add_device_uart(void) {}
 #else

target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h

@@ -195,8 +195,6 @@ static inline u32 ar71xx_usb_ctrl_rr(unsigned reg)
 	return __raw_readl(ar71xx_usb_ctrl_base + reg);
 }
 
-extern void ar71xx_add_device_usb(void) __init;
-
 /*
  * GPIO block
  */