ASoC: wm8904: Fix GPIO and MICBIAS initialisation for regmap conversion

We no longer have a flat ASoC cache so can't peer directly into the array
any more but should instead use the register I/O functions to update the
cache.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org (v3.4)
diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index 65d525d..4e190b5 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -2084,7 +2084,6 @@
 {
 	struct wm8904_priv *wm8904 = snd_soc_codec_get_drvdata(codec);
 	struct wm8904_pdata *pdata = wm8904->pdata;
-	u16 *reg_cache = codec->reg_cache;
 	int ret, i;
 
 	codec->cache_sync = 1;
@@ -2180,14 +2179,18 @@
 			if (!pdata->gpio_cfg[i])
 				continue;
 
-			reg_cache[WM8904_GPIO_CONTROL_1 + i]
-				= pdata->gpio_cfg[i] & 0xffff;
+			regmap_update_bits(wm8904->regmap,
+					   WM8904_GPIO_CONTROL_1 + i,
+					   0xffff,
+					   pdata->gpio_cfg[i]);
 		}
 
 		/* Zero is the default value for these anyway */
 		for (i = 0; i < WM8904_MIC_REGS; i++)
-			reg_cache[WM8904_MIC_BIAS_CONTROL_0 + i]
-				= pdata->mic_cfg[i];
+			regmap_update_bits(wm8904->regmap,
+					   WM8904_MIC_BIAS_CONTROL_0 + i,
+					   0xffff,
+					   pdata->mic_cfg[i]);
 	}
 
 	/* Set Class W by default - this will be managed by the Class