ASoC: Allow register defaults to be larger than unsigned short

Devices that need this exist; obviously the newer regmap defaults
mechanism will deal with this more happily.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -622,7 +622,7 @@ struct snd_soc_codec_driver {
 	int (*volatile_register)(struct snd_soc_codec *, unsigned int);
 	int (*readable_register)(struct snd_soc_codec *, unsigned int);
 	int (*writable_register)(struct snd_soc_codec *, unsigned int);
-	short reg_cache_size;
+	unsigned int reg_cache_size;
 	short reg_cache_step;
 	short reg_word_size;
 	const void *reg_cache_default;