ASoC: Need to convert wm5100 cache sync to direct regmap usage too

ASoC knows nothing about the cache now.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm5100.c

@@ -1400,7 +1400,7 @@ static int wm5100_set_bias_level(struct snd_soc_codec *codec,
 				break;
 			}
 
-			snd_soc_cache_sync(codec);
+			regcache_sync(wm5100->regmap);
 		}
 		break;