ASoC: simple-card-utils: add asoc_simple_card_canonicalize_cpu()

simple-card needs remove dai_link->cpu_dai_name if it CPU was
single DAI.
This patch makes this method simple style standard.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index a71d46a..f760f55 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -62,5 +62,7 @@
 			      struct asoc_simple_dai *simple_dai);
 
 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link);
+void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
+				      int is_single_links);
 
 #endif /* __SIMPLE_CARD_CORE_H */