ASoC: add snd_soc_component_read32

Current codec drivers are using snd_soc_read(). It will be replaced
into snd_soc_component_read(), but these 2 are using different style.
For example, it will be

	- val = snd_soc_read(xxx, reg);
	+ ret = snd_soc_component_read(xxx, reg, &val);
	+ if (ret < 0) {
	+	...
	+ }

To more smooth replace, let's add snd_soc_component_read32
which is copied from snd_soc_read()

	- val = snd_soc_read(xxx, reg);
	+ val = snd_soc_component_read32(xxx, reg);
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -1498,6 +1498,8 @@ static inline int snd_soc_cache_sync(struct snd_soc_codec *codec)
 /* component IO */
 int snd_soc_component_read(struct snd_soc_component *component,
 	unsigned int reg, unsigned int *val);
+unsigned int snd_soc_component_read32(struct snd_soc_component *component,
+				      unsigned int reg);
 int snd_soc_component_write(struct snd_soc_component *component,
 	unsigned int reg, unsigned int val);
 int snd_soc_component_update_bits(struct snd_soc_component *component,

sound/soc/soc-io.c

@@ -41,6 +41,20 @@ int snd_soc_component_read(struct snd_soc_component *component,
 }
 EXPORT_SYMBOL_GPL(snd_soc_component_read);
 
+unsigned int snd_soc_component_read32(struct snd_soc_component *component,
+				      unsigned int reg)
+{
+	unsigned int val;
+	int ret;
+
+	ret = snd_soc_component_read(component, reg, &val);
+	if (ret < 0)
+		return -1;
+
+	return val;
+}
+EXPORT_SYMBOL_GPL(snd_soc_component_read32);
+
 /**
  * snd_soc_component_write() - Write register value
  * @component: Component to write to