ASoC: simple-audio-card: merge simple_parse_mclk_fs() into simple_link_init()

Now graph_link_init() is parsing dai_link related property.
Let's handle mclk_fs on it, too.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://msgid.link/r/87v82yfrv0.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>