ASoC: wm8974: fix a wrong bit definition

The wm8974 datasheet defines BUFIOEN as bit 2.

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Acked-by: Liam Girdwood <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>
Cc: [e-mail]

sound/soc/codecs/wm8974.c

···
 };
 
 #define WM8974_POWER1_BIASEN  0x08
-#define WM8974_POWER1_BUFIOEN 0x10
+#define WM8974_POWER1_BUFIOEN 0x04
 
 struct wm8974_priv {
 	struct snd_soc_codec codec;