ASoC: wm_hubs: Move CODEC stored in private data into wm_hubs

Further wm_hubs code will use this.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm_hubs.h b/sound/soc/codecs/wm_hubs.h
index da2dc89..a5a09e6 100644
--- a/sound/soc/codecs/wm_hubs.h
+++ b/sound/soc/codecs/wm_hubs.h
@@ -46,6 +46,8 @@
 
 	bool dcs_done_irq;
 	struct completion dcs_done;
+
+	struct snd_soc_codec *codec;
 };
 
 extern int wm_hubs_add_analogue_controls(struct snd_soc_codec *);