ASoC: use .auto_selectable_formats

Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> says:

This is v3 of "ASoC: use .auto_selectable_formats", but separated into
small blocks. It is Step1, and it will be Step4 in total.

x: this patch-set

	[x] Step1: ASoC: a to b
	[ ] Step2: ASoC: codec: ...
	[ ] Step3: ASoC: d to r
	[ ] Step4: ASoC: r to x

Current ASoC supports snd_soc_daifmt_parse_format() which can specify DAI
format by "dai-format" property from DT.
But strictly speaking, it is SW settings, so doesn't match to DT's policy.

Current ASoC is supporting auto format select via
snd_soc_dai_ops :: .auto_selectable_formats.
But the user is very few today.

DT doesn't need to specify the DAI format via "dai-format", if both CPU
and Codec drivers were supporting .auto_selectable_formats. It will be
automatically selected from .auto_selectable_formats.

One note is that auto select might not find best format on some CPU/Codec
combination. So "dai-format" is necessary anyway.

Link: https://lore.kernel.org/r/8733zfj5jj.wl-kuninori.morimoto.gx@renesas.com
Link: https://lore.kernel.org/r/87pl0r20qo.wl-kuninori.morimoto.gx@renesas.com
Link: https://patch.msgid.link/87zezljgxy.wl-kuninori.morimoto.gx@renesas.com

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