ASoC: soc-topology.c: remove unnecessary dai_link->platform

dai_link->platform is no longer needed if CPU and Platform are
same Component. This patch removes unnecessary dai_link->platform.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87jzz7jczp.wl-kuninori.morimoto.gx@renesas.com


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