led: led_pwm: typo 'iverted' on code comment

change iverted to inverted.

Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
diff --git a/drivers/led/led_pwm.c b/drivers/led/led_pwm.c
index 0ebae35..7c8eae9 100644
--- a/drivers/led/led_pwm.c
+++ b/drivers/led/led_pwm.c
@@ -123,7 +123,7 @@
 	priv->enabled =  !!def_brightness;
 
 	/*
-	 * No need to handle pwm iverted case (active_low)
+	 * No need to handle pwm inverted case (active_low)
 	 * because of pwm_set_invert function
 	 */
 	if (def_brightness < max_brightness)