ASoC: tegra: tegra_rt5640: use devm_snd_soc_register_card()

Using devm_snd_soc_register_card() can make the code
shorter and cleaner.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200929112936.47441-1-miaoqinglang@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra_rt5640.c

@@ -192,7 +192,7 @@ static int tegra_rt5640_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = snd_soc_register_card(card);
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret) {
 		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
 			ret);
@@ -202,15 +202,6 @@ static int tegra_rt5640_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int tegra_rt5640_remove(struct platform_device *pdev)
-{
-	struct snd_soc_card *card = platform_get_drvdata(pdev);
-
-	snd_soc_unregister_card(card);
-
-	return 0;
-}
-
 static const struct of_device_id tegra_rt5640_of_match[] = {
 	{ .compatible = "nvidia,tegra-audio-rt5640", },
 	{},
@@ -223,7 +214,6 @@ static struct platform_driver tegra_rt5640_driver = {
 		.of_match_table = tegra_rt5640_of_match,
 	},
 	.probe = tegra_rt5640_probe,
-	.remove = tegra_rt5640_remove,
 };
 module_platform_driver(tegra_rt5640_driver);