ASoC: atmel-i2s: Set symmetric sample bits

The I2S needs to have the same sample bits for both capture and playback
streams.

Fixes: b543e46 ("ASoC: atmel-i2s: add driver for the new Atmel I2S controller")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>

Author: Codrin Ciubotariu

sound/soc/atmel/atmel-i2s.c

@@ -542,6 +542,7 @@ static struct snd_soc_dai_driver atmel_i2s_dai = {
 	},
 	.ops = &atmel_i2s_dai_ops,
 	.symmetric_rates = 1,
+	.symmetric_samplebits = 1,
 };
 
 static const struct snd_soc_component_driver atmel_i2s_component = {