ASoC: adau1701: remove control_data assignment

codec->control_data has to be left unset to make the ASoC core access
the regmap properly.

That bug slipped in during a rebase session of the driver refactoring.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/adau1701.c

@@ -600,8 +600,6 @@ static int adau1701_probe(struct snd_soc_codec *codec)
 	unsigned int val;
 	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
 
-	codec->control_data = to_i2c_client(codec->dev);
-
 	/*
 	 * Let the pll_clkdiv variable default to something that won't happen
 	 * at runtime. That way, we can postpone the firmware download from