ASoC: mediatek: mt8183: make headset codec optional

Make headset codec optional because some variant machines may not
have an audio jack.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20190716032417.19015-1-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8183/mt8183-mt6358-ts3a227-max98357.c

@@ -352,8 +352,6 @@ static struct snd_soc_card mt8183_mt6358_ts3a227_max98357_card = {
 	.owner = THIS_MODULE,
 	.dai_link = mt8183_mt6358_ts3a227_max98357_dai_links,
 	.num_links = ARRAY_SIZE(mt8183_mt6358_ts3a227_max98357_dai_links),
-	.aux_dev = &mt8183_mt6358_ts3a227_max98357_headset_dev,
-	.num_aux_devs = 1,
 };
 
 static int
@@ -404,10 +402,9 @@ mt8183_mt6358_ts3a227_max98357_dev_probe(struct platform_device *pdev)
 	mt8183_mt6358_ts3a227_max98357_headset_dev.codec_of_node =
 		of_parse_phandle(pdev->dev.of_node,
 				 "mediatek,headset-codec", 0);
-	if (!mt8183_mt6358_ts3a227_max98357_headset_dev.codec_of_node) {
-		dev_err(&pdev->dev,
-			"Property 'mediatek,headset-codec' missing/invalid\n");
-		return -EINVAL;
+	if (mt8183_mt6358_ts3a227_max98357_headset_dev.codec_of_node) {
+		card->aux_dev = &mt8183_mt6358_ts3a227_max98357_headset_dev;
+		card->num_aux_devs = 1;
 	}
 
 	default_pins =