ASoC: codecs: wcd934x: Simplify &pdev->dev in probe

The probe already stores pointer to &pdev->dev, so use it to make the
code a bit easier to read.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230418074630.8681-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>