ASoC: Note jumper settings for smdk_wm9713 driver on SMDK6410

The board supports both GPIO sets for the AC97 bus and the analogue
outputs can be switched between this and the WM8580 so add some
comments saying what the setup the standard kernel expects is.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/s3c24xx/smdk_wm9713.c

@@ -21,6 +21,12 @@
 
 static struct snd_soc_card smdk;
 
+/*
+ * Default CFG switch settings to use this driver:
+ *
+ *   SMDK6410: Set CFG1 1-3 On, CFG2 1-4 Off
+ */
+
 /*
  Playback (HeadPhone):-
 	Headphone Playback Switch - On