ASoC: Make pmdown_time a per-card setting

Make the pmdown_time a per-card setting rather than a global one,
initialised before the card initialisation runs. This allows cards
to override the default setting if it makes sense to do so (for
example, due to an unavoidable pop).

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

include/sound/soc.h

@@ -521,6 +521,8 @@ struct snd_soc_card {
 	int (*set_bias_level)(struct snd_soc_card *,
 			      enum snd_soc_bias_level level);
 
+	int pmdown_time;
+
 	/* CPU <--> Codec DAI links  */
 	struct snd_soc_dai_link *dai_link;
 	int num_links;