ASoC: loongson: drop of_match_ptr for OF device id

The ASoC Sound Card driver can be compile tested with !CONFIG_OF
making 'loongson_asoc_dt_ids' unused:

sound/soc/loongson/loongson_card.c:200:34: warning: unused variable 'loongson_asoc_dt_ids' [-Wunused-const-variable]

As krzysztof advice, we drop of_match_ptr so the device id
can also be used on ACPI.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]
Fixes: d24028606e76 ("ASoC: loongson: Add Loongson ASoC Sound Card Support")
Signed-off-by: YingKun Meng <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/loongson/loongson_card.c

···
 	.driver = {
 		.name = "loongson-asoc-card",
 		.pm = &snd_soc_pm_ops,
-		.of_match_table = of_match_ptr(loongson_asoc_dt_ids),
+		.of_match_table = loongson_asoc_dt_ids,
 	},
 };
 module_platform_driver(loongson_audio_driver);