ASoC: simple-scu-card: remove unused definitions

#include <sound/soc-dai.h>

#include <sound/simple_card_utils.h>

struct asoc_simple_card_of_data {

	const char *prefix;

	const struct snd_soc_dapm_route *routes;

	int num_routes;

};

static const struct of_device_id asoc_simple_card_of_match[] = {

	{ .compatible = "renesas,rsrc-card", },

	{ .compatible = "simple-scu-audio-card", },

};

MODULE_DEVICE_TABLE(of, asoc_simple_card_of_match);

#define IDX_CPU		0

#define IDX_CODEC	1

struct asoc_simple_card_priv {

	struct snd_soc_card snd_card;

	struct snd_soc_codec_conf codec_conf;