media: i2c: ov5645: Drop fetching the clk reference by name

The OV5645 sensor has a single clock source, so just drop fetching the
clk reference by name.

This is in preparation to drop the "clock-names" property from the DT
binding.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

drivers/media/i2c/ov5645.c

@@ -1090,7 +1090,7 @@ static int ov5645_probe(struct i2c_client *client)
 	}
 
 	/* get system clock (xclk) */
-	ov5645->xclk = devm_clk_get(dev, "xclk");
+	ov5645->xclk = devm_clk_get(dev, NULL);
 	if (IS_ERR(ov5645->xclk)) {
 		dev_err(dev, "could not get xclk");
 		return PTR_ERR(ov5645->xclk);