ASoC: pcm3168a: add .auto_selectable_formats support

By this patch, DAI format might be automatically selected
(Depends on paired DAI).

Link: https://lore.kernel.org/r/871rb3hypy.wl-kuninori.morimoto.gx@renesas.com
Link: https://lore.kernel.org/r/871racbx0w.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87eedsnc6z.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>