ASoC: add multi Component support

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

On below HW case, we would like to use it as "2 Cards",
but unfortunately it is impossible in intuitive way,
or possible but not intuitive way.
In reality, it is handled as "1 big Card" today.

	+-- basic board --------+
	|+--------+             |
	|| CPU ch0| <--> CodecA |
	||     ch1| <-+         |
	|+--------+   |         |
	+-------------|---------+
	+-- expansion board ----+
	|             |         |
	|             +-> CodecB|
	+-----------------------+

To handling it as intuitive "2 Cards", this patch-set
adds multi Component support.

To enable this patch-set, I included [01/15] patch into this patch-set
which is posted but not yet accepted.