clk: twl6040: Register the clock as of_clk_provider

In order ot be able to use the pdmclk clock via DT it need to be registered
as of_clk_provide.
Since the twl6040 clock driver does not have it's own DT node, use the
parent's node for registering.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-twl6040.c

@@ -95,7 +95,8 @@ static int twl6040_clk_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, clkdata);
 
-	return 0;
+	return of_clk_add_provider(pdev->dev.parent->of_node,
+				   of_clk_src_simple_get, clkdata->clk);
 }
 
 static struct platform_driver twl6040_clk_driver = {