soc: mediatek: mutex: Use dev_err_probe()

Replace the open-code with dev_err_probe() to simplify the code.

Signed-off-by: Ye Xingchen <ye.xingchen@zte.com.cn>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/202303241017290414354@zte.com.cn


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>