ASoC: simple-card-utils.c: add missing dlc->of_node

commit 90de551c1bf ("ASoC: simple-card-utils.c: enable multi Component
support") added muiti Component support, but was missing to add
dlc->of_node. Because of it, Sound device list will indicates strange
name if it was DPCM connection and driver supports dai->driver->dai_args,
like below

> aplay -l
card X: sndulcbmix [xxxx], device 0: fe.(null).rsnd-dai.0 (*) []
... ^^^^^^

It will be fixed by this patch

> aplay -l
card X: sndulcbmix [xxxx], device 0: [e-mail]-dai.0 (*) []
... ^^^^^^^^^^^^^^

Signed-off-by: Kuninori Morimoto <[e-mail]>
Reviewed-by: Daniel Baluta <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/generic/simple-card-utils.c

···
 	args.np = ep;
 	dai = snd_soc_get_dai_via_args(&args);
 	if (dai) {
+		dlc->of_node  = node;
 		dlc->dai_name = snd_soc_dai_name_get(dai);
 		dlc->dai_args = snd_soc_copy_dai_args(dev, &args);
 		if (!dlc->dai_args)