ASoC: fsl_ssi: enable AC'97 asymmetric rates

AC'97 bus can support asymmetric playback/capture rates
so enable them in this case in fsl_ssi driver.

Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 2ce9e1d..f3034b9 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -1377,7 +1377,9 @@
 
 	/* Are the RX and the TX clocks locked? */
 	if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) {
-		ssi_private->cpu_dai_drv.symmetric_rates = 1;
+		if (!fsl_ssi_is_ac97(ssi_private))
+			ssi_private->cpu_dai_drv.symmetric_rates = 1;
+
 		ssi_private->cpu_dai_drv.symmetric_channels = 1;
 		ssi_private->cpu_dai_drv.symmetric_samplebits = 1;
 	}