ASoC: fsl_sai: Remove unnecessary FIFO reset in ISR

ASoC: fsl_sai: Remove unnecessary FIFO reset in ISR

The FIFO reset drops the words in the FIFO, which may cause
channel swap when SAI module is running, especially when the
DMA speed is low. So it is not good to do FIFO reset in ISR,
then remove the operation.

Fixes: eec9718ec8d1 ("ASoC: fsl_sai: Add isr to deal with error flag")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1660713867-26921-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>