devm_clk_get() fails on ACPI-based platforms, where firmware does not
provide a direct reference to the clock producer.

Replace devm_clk_get() with the new v4l2 helper
devm_v4l2_sensor_clk_get() that works on both DT- and ACPI-based
platforms to retrieve a reference to the clock producer from firmware.

Signed-off-by: Mehdi Djait <mehdi.djait@linux.intel.com>

diff --git a/drivers/media/i2c/ov9640.c b/drivers/media/i2c/ov9640.c
index 01dbc0ba89c8..686d69c1a8eb 100644
--- a/drivers/media/i2c/ov9640.c
+++ b/drivers/media/i2c/ov9640.c
@@ -718,7 +718,7 @@ static int ov9640_probe(struct i2c_client *client)
 
 	priv->subdev.ctrl_handler = &priv->hdl;
 
-	priv->clk = devm_clk_get(&client->dev, "mclk");
+	priv->clk = devm_v4l2_sensor_clk_get(&client->dev, "mclk");
 	if (IS_ERR(priv->clk)) {
 		ret = PTR_ERR(priv->clk);
 		goto ectrlinit;