ASoC: fsl_spdif: Remove superfluous error message around platform_get_irq()

The platform_get_irq() prints error message telling that interrupt is
missing, hence there is no need to duplicated that message.

Signed-off-by: Tan Zhongjun <tanzhongjun@yulong.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20210610040037.1064-1-hbut_tan@163.com
Signed-off-by: Mark Brown <broonie@kernel.org>