ASoC: Add compress_type as a member to snd_soc_codec

We need to keep a copy of the compress_type supplied by the codec driver
so that we can override it if necessary with whatever the machine driver
has provided us with.  The reason for not modifying the codec->driver
struct directly is that ideally we'd like to keep it const.

Adjust the code in soc-cache and soc-core to make use of the compress_type
member in the snd_soc_codec struct.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 78b25e8..cb58b11 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -1550,11 +1550,11 @@
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(cache_types); ++i)
-		if (cache_types[i].id == codec->driver->compress_type)
+		if (cache_types[i].id == codec->compress_type)
 			break;
 	if (i == ARRAY_SIZE(cache_types)) {
 		dev_err(codec->dev, "Could not match compress type: %d\n",
-			codec->driver->compress_type);
+			codec->compress_type);
 		return -EINVAL;
 	}