ASoC: Use more idiomatic driver name for WM8731

Make dev_() prints much prettier.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 2650fac..e17c714 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -707,7 +707,7 @@
 
 static struct i2c_driver wm8731_i2c_driver = {
 	.driver = {
-		.name = "WM8731 I2C Codec",
+		.name = "wm8731",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8731_i2c_probe,