ASoC: wm8994: Add trace showing wm8958_micd_set_rate()

This can be helpful to users when tuning their systems.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8994.c

@@ -119,6 +119,10 @@ static void wm8958_micd_set_rate(struct snd_soc_codec *codec)
 	val = rates[best].start << WM8958_MICD_BIAS_STARTTIME_SHIFT
 		| rates[best].rate << WM8958_MICD_RATE_SHIFT;
 
+	dev_dbg(codec->dev, "MICD rate %d,%d for %dHz %s\n",
+		rates[best].start, rates[best].rate, sysclk,
+		idle ? "idle" : "active");
+
 	snd_soc_update_bits(codec, WM8958_MIC_DETECT_1,
 			    WM8958_MICD_BIAS_STARTTIME_MASK |
 			    WM8958_MICD_RATE_MASK, val);