firmware: imx: Remove call to devm_of_platform_populate

IMX DSP device is created by SOF layer. The current call to
devm_of_platform_populate is not needed and it doesn't produce
any effects.

Fixes: ffbf23d5 ("firmware: imx: Add DSP IPC protocol interface)
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/firmware/imx/imx-dsp.c

@@ -114,7 +114,7 @@ static int imx_dsp_probe(struct platform_device *pdev)
 
 	dev_info(dev, "NXP i.MX DSP IPC initialized\n");
 
-	return devm_of_platform_populate(dev);
+	return 0;
 out:
 	kfree(chan_name);
 	for (j = 0; j < i; j++) {