ENGR00320241 ASoC: fsl_spdif: Complete the volatile register list

Not only SIS but also other read-only or write-only reigsters should be marked
as volatile register so as not to let regcache cache them. So this patch just
adds those missing registers.

Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
(cherry picked from commit 56ad235ba2)

sound/soc/fsl/fsl_spdif.c

@@ -1029,6 +1029,15 @@ static bool fsl_spdif_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case REG_SPDIF_SIS:
+	case REG_SPDIF_SRL:
+	case REG_SPDIF_SRR:
+	case REG_SPDIF_SRCSH:
+	case REG_SPDIF_SRCSL:
+	case REG_SPDIF_SRU:
+	case REG_SPDIF_SRQ:
+	case REG_SPDIF_STL:
+	case REG_SPDIF_STR:
+	case REG_SPDIF_SRFM:
 		return true;
 	default:
 		return false;