ASoC: codecs: simple-mux: Use dev_err_probe() helper

Use the dev_err_probe() helper, instead of open-coding the same
operation.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/20211214020843.2225831-9-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>