leds: flash: Add flash registration with undefined CONFIG_LEDS_CLASS_FLASH

Add flash registration with undefined CONFIG_LEDS_CLASS_FLASH,
and move the same registration functions outside of #ifdef block.
Signed-off-by: Gene Chen <gene_chen@richtek.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

include/linux/led-class-flash.h

@@ -85,6 +85,7 @@ static inline struct led_classdev_flash *lcdev_to_flcdev(
 	return container_of(lcdev, struct led_classdev_flash, led_cdev);
 }
 
+#if IS_ENABLED(CONFIG_LEDS_CLASS_FLASH)
 /**
  * led_classdev_flash_register_ext - register a new object of LED class with
  *				     init data and with support for flash LEDs
@@ -98,12 +99,6 @@ int led_classdev_flash_register_ext(struct device *parent,
 				    struct led_classdev_flash *fled_cdev,
 				    struct led_init_data *init_data);
 
-static inline int led_classdev_flash_register(struct device *parent,
-					   struct led_classdev_flash *fled_cdev)
-{
-	return led_classdev_flash_register_ext(parent, fled_cdev, NULL);
-}
-
 /**
  * led_classdev_flash_unregister - unregisters an object of led_classdev class
  *				   with support for flash LEDs
@@ -118,15 +113,44 @@ int devm_led_classdev_flash_register_ext(struct device *parent,
 				     struct led_init_data *init_data);
 
 
+void devm_led_classdev_flash_unregister(struct device *parent,
+					struct led_classdev_flash *fled_cdev);
+
+#else
+
+static inline int led_classdev_flash_register_ext(struct device *parent,
+				    struct led_classdev_flash *fled_cdev,
+				    struct led_init_data *init_data)
+{
+	return 0;
+}
+
+static inline void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev) {};
+static inline int devm_led_classdev_flash_register_ext(struct device *parent,
+				     struct led_classdev_flash *fled_cdev,
+				     struct led_init_data *init_data)
+{
+	return 0;
+}
+
+static inline void devm_led_classdev_flash_unregister(struct device *parent,
+					struct led_classdev_flash *fled_cdev)
+{};
+
+#endif  /* IS_ENABLED(CONFIG_LEDS_CLASS_FLASH) */
+
+static inline int led_classdev_flash_register(struct device *parent,
+					   struct led_classdev_flash *fled_cdev)
+{
+	return led_classdev_flash_register_ext(parent, fled_cdev, NULL);
+}
+
 static inline int devm_led_classdev_flash_register(struct device *parent,
 				     struct led_classdev_flash *fled_cdev)
 {
 	return devm_led_classdev_flash_register_ext(parent, fled_cdev, NULL);
 }
 
-void devm_led_classdev_flash_unregister(struct device *parent,
-					struct led_classdev_flash *fled_cdev);
-
 /**
  * led_set_flash_strobe - setup flash strobe
  * @fled_cdev: the flash LED to set strobe on