ASoC: max98090: revert invalid fix for handling SHDN

Reverts commit 62d5ae4c ("ASoC: max98090: save and restore
SHDN when changing sensitive registers").

A critical side-effect was observed: when keep playing something,
the recorded sound has chance to break (clipping).
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200214105744.82258-2-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98090.h

@@ -1539,8 +1539,7 @@ struct max98090_priv {
 	unsigned int pa2en;
 	unsigned int sidetone;
 	bool master;
-	int saved_count;
-	int saved_shdn;
+	bool shdn_pending;
 };
 
 int max98090_mic_detect(struct snd_soc_component *component,