ASoC: Add a per-card DAPM context

This means that rather than adding the board specific DAPM widgets to a
random CODEC DAPM context they can be added to the card itself which is
a bit cleaner. Previously there only was one DAPM context and it was
tied to the single supported CODEC.

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

include/sound/soc.h

@@ -729,6 +729,9 @@ struct snd_soc_card {
 	struct list_head paths;
 	struct list_head dapm_list;
 
+	/* Generic DAPM context for the card */
+	struct snd_soc_dapm_context dapm;
+
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs_card_root;
 	struct dentry *debugfs_pop_time;