ASoC: codecs: wcd938x: handle deferred probe

WCD938x sound codec driver ignores return status of getting regulators
and returns EINVAL instead of EPROBE_DEFER.  If regulator provider
probes after the codec, system is left without probed audio:

  wcd938x_codec audio-codec: wcd938x_probe: Fail to obtain platform data
  wcd938x_codec: probe of audio-codec failed with error -22

Fixes: 16572522 ("ASoC: codecs: wcd938x-sdw: add SoundWire driver")
Cc:  <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240117151208.1219755-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x.c

@@ -3589,7 +3589,7 @@ static int wcd938x_probe(struct platform_device *pdev)
 	ret = wcd938x_populate_dt_data(wcd938x, dev);
 	if (ret) {
 		dev_err(dev, "%s: Fail to obtain platform data\n", __func__);
-		return -EINVAL;
+		return ret;
 	}
 
 	ret = wcd938x_add_slave_components(wcd938x, dev, &match);