ASoC: sgtl5000: Fix comment about register addresses

The list below the comment relates to sgtl5000 registers addresses, so change
the comment to improve the description.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/sgtl5000.h b/sound/soc/codecs/sgtl5000.h
index 8a9f435..4b69229 100644
--- a/sound/soc/codecs/sgtl5000.h
+++ b/sound/soc/codecs/sgtl5000.h
@@ -12,7 +12,7 @@
 #define _SGTL5000_H
 
 /*
- * Register values.
+ * Registers addresses
  */
 #define SGTL5000_CHIP_ID			0x0000
 #define SGTL5000_CHIP_DIG_POWER			0x0002