ASoC: fsl_sai: Fix incorrect register writing in fsl_sai_isr()

In the rx irq handling part, we should clear the flags in RCSR not TCSR.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/fsl/fsl_sai.c

@@ -106,7 +106,7 @@ static irqreturn_t fsl_sai_isr(int irq, void *devid)
 	xcsr &= ~FSL_SAI_CSR_xF_MASK;
 
 	if (flags)
-		regmap_write(sai->regmap, FSL_SAI_TCSR, flags | xcsr);
+		regmap_write(sai->regmap, FSL_SAI_RCSR, flags | xcsr);
 
 out:
 	if (irq_none)