ASoC: simple-scu-card: add dai-link support

simple-card is supporting dai-link support, but simple-scu-card
doesn't have it.
This patch support it. This is prepare for merging simple-card
and simple-scu-card.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>