ASoC: wm8997: Set symmetric samplebits on AIFs

Different playback and capture bits-per-sample
are not supported on the AIFs

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/wm8997.c b/sound/soc/codecs/wm8997.c
index bb9b47b..ab33fe5 100644
--- a/sound/soc/codecs/wm8997.c
+++ b/sound/soc/codecs/wm8997.c
@@ -967,6 +967,7 @@
 		 },
 		.ops = &arizona_dai_ops,
 		.symmetric_rates = 1,
+		.symmetric_samplebits = 1,
 	},
 	{
 		.name = "wm8997-aif2",
@@ -988,6 +989,7 @@
 		 },
 		.ops = &arizona_dai_ops,
 		.symmetric_rates = 1,
+		.symmetric_samplebits = 1,
 	},
 	{
 		.name = "wm8997-slim1",