ASoC: remove unused comment

`type` parameter is not longer used in `snd_soc_codec_set_cache_io`,
so remove this line.

Signed-off-by: Lu Guanqun <guanqun.lu@intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index f46a198..a217db2 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -484,7 +484,6 @@
  * snd_soc_codec_set_cache_io: Set up standard I/O functions.
  *
  * @codec: CODEC to configure.
- * @type: Type of cache.
  * @addr_bits: Number of bits of register address data.
  * @data_bits: Number of bits of data per register.
  * @control: Control bus used.