ASoC: simple-card: add simple_link_init()

This patch adds simple_link_init() and share dai_link setting code.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87bla8i41b.wl-kuninori.morimoto.gx@renesas.com


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