ASoC: cs42l52: Add platform data for reset gpio

This patch adds platform data support for a reset GPIO.
Also uses reset_gpio to toggle reset of the CODEC

Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/include/sound/cs42l52.h b/include/sound/cs42l52.h
index 4c68955..7c2be4a 100644
--- a/include/sound/cs42l52.h
+++ b/include/sound/cs42l52.h
@@ -31,6 +31,8 @@
 	/* Charge Pump Freq. Check datasheet Pg73 */
 	unsigned int chgfreq;
 
+	/* Reset GPIO */
+	unsigned int reset_gpio;
 };
 
 #endif /* __CS42L52_H */