ASoC: core: Generic ac97 link reset functions

This patch adds generic ac97 reset functions using pincontrol and gpio
parsed from devicetree.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 6eabee7..c0ac3bc 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -468,6 +468,8 @@
 void snd_soc_free_ac97_codec(struct snd_soc_codec *codec);
 
 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);
+int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
+		struct platform_device *pdev);
 
 /*
  *Controls