ASoC: simple-card: add simple_link_init()

Original commit 43439227

 ("ASoC: simple-card: add
simple_link_init()") are rejected, and this is remake version of it.

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

Reported-by: "kernelci.org bot" <bot@kernelci.org>
Fixes: 25c4a9b6 ("ASoC: simple-card: Fix breakage on kontron-sl28-var3-ads2")
Fixes: 43439227

 ("ASoC: simple-card: add simple_link_init()")
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/87fsyuax1g.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>