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/ar0521.c b/drivers/media/i2c/ar0521.c
index 24873149096c..87fb12774b95 100644
--- a/drivers/media/i2c/ar0521.c
+++ b/drivers/media/i2c/ar0521.c
@@ -1077,7 +1077,7 @@ static int ar0521_probe(struct i2c_client *client)
 	}
 
 	/* Get master clock (extclk) */
-	sensor->extclk = devm_clk_get(dev, "extclk");
+	sensor->extclk = devm_v4l2_sensor_clk_get(dev, "extclk");
 	if (IS_ERR(sensor->extclk)) {
 		dev_err(dev, "failed to get extclk\n");
 		return PTR_ERR(sensor->extclk);