media: v4l2-flash-led-class.h: add kernel-doc to two helper funcs

There are two helper functions at v4l2-flash-led-class.h
that aren't documented.

Document them.

Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

include/media/v4l2-flash-led-class.h

···
 	struct v4l2_ctrl **ctrls;
 };
 
+/**
+ * v4l2_subdev_to_v4l2_flash - Returns a &struct v4l2_flash from the
+ * &struct v4l2_subdev embedded on it.
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ */
 static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
 							struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct v4l2_flash, sd);
 }
 
+/**
+ * v4l2_ctrl_to_v4l2_flash - Returns a &struct v4l2_flash from the
+ * &struct v4l2_ctrl embedded on it.
+ *
+ * @c: pointer to &struct v4l2_ctrl
+ */
 static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
 {
 	return container_of(c->handler, struct v4l2_flash, hdl);