leds: aat1290: add 'static' modifier to init_mm_current_scale

Function init_mm_current_scale is used only locally. Make it static then.
Signed-off-by: NJacek Anaszewski <j.anaszewski@samsung.com>

drivers/leds/leds-aat1290.c

@@ -331,7 +331,7 @@ static void aat1290_led_validate_mm_current(struct aat1290_led *led,
 	cfg->max_brightness = b + 1;
 }
 
-int init_mm_current_scale(struct aat1290_led *led,
+static int init_mm_current_scale(struct aat1290_led *led,
 			struct aat1290_led_config_data *cfg)
 {
 	int max_mm_current_percent[] = { 20, 22, 25, 28, 32, 36, 40, 45, 50, 56,