ASoC: makes CPU/Codec channel connection map more

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

Current ASoC is supporting CPU/Codec = N:M (N < M) connection by using
ch_map idea. This patch-set expands it that all connection uses this idea,
and no longer N < M limit [1][2].

Link: https://lore.kernel.org/r/87fs6wuszr.wl-kuninori.morimoto.gx@renesas.com [1]
Link: https://lore.kernel.org/r/878r7yqeo4.wl-kuninori.morimoto.gx@renesas.com [2]

ASoC core code ([PATCH 1/5]) is same as v6 and it was tested by Pierre-Louis,
and Jerome. Big change on v7 is basically for Audio-Graph-Card2.