ASoC: sam9x5_wm8731: change to work in DSP A mode

Change sam9x5 with wm8731 work in DSP A mode, this will fix the
left/right channel swap issue.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Tested-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/atmel/sam9x5_wm8731.c

@@ -109,7 +109,7 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	dai->stream_name = "WM8731 PCM";
 	dai->codec_dai_name = "wm8731-hifi";
 	dai->init = sam9x5_wm8731_init;
-	dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
+	dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
 		| SND_SOC_DAIFMT_CBM_CFM;
 
 	ret = snd_soc_of_parse_card_name(card, "atmel,model");