media: ar0521: Setup controls at s_stream time

Setup all the registered controls at s_stream(1) time instead of
manually configure gains.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ar0521.c

@@ -399,7 +399,7 @@ static int ar0521_set_stream(struct ar0521_dev *sensor, bool on)
 		if (ret)
 			goto err;
 
-		ret = ar0521_set_gains(sensor);
+		ret =  __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
 		if (ret)
 			goto err;