ASoC: Fix reg_word_size for ak4104

According to the register map in datasheet, the registers are 8 bit.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/ak4104.c

@@ -247,7 +247,7 @@ static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 	.probe =	ak4104_probe,
 	.remove =	ak4104_remove,
 	.reg_cache_size = AK4104_NUM_REGS,
-	.reg_word_size = sizeof(u16),
+	.reg_word_size = sizeof(u8),
 };
 
 static int ak4104_spi_probe(struct spi_device *spi)