ASoC: clarify Codec2Codec params

Merge series from Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>:

ASoC is supporting Codec2Codec, but its parameter name is
"params" and "num_params" which are very unclear naming.

This patch-set clarifies it by replacing to c2c_params / num_c2c_params.