ASoC: core: move definition of enum snd_soc_bias_level

To fix compilation error:

- error: field 'XXX' has incomplete type

Moves definition of enum snd_soc_bias_level from soc.h to soc-dapm.h.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200625153543.85039-2-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dapm.h

@@ -376,6 +376,24 @@ struct snd_soc_dapm_widget_list;
 struct snd_soc_dapm_update;
 enum snd_soc_dapm_direction;
 
+/*
+ * Bias levels
+ *
+ * @ON:      Bias is fully on for audio playback and capture operations.
+ * @PREPARE: Prepare for audio operations. Called before DAPM switching for
+ *           stream start and stop operations.
+ * @STANDBY: Low power standby state when no playback/capture operations are
+ *           in progress. NOTE: The transition time between STANDBY and ON
+ *           should be as fast as possible and no longer than 10ms.
+ * @OFF:     Power Off. No restrictions on transition times.
+ */
+enum snd_soc_bias_level {
+	SND_SOC_BIAS_OFF = 0,
+	SND_SOC_BIAS_STANDBY = 1,
+	SND_SOC_BIAS_PREPARE = 2,
+	SND_SOC_BIAS_ON = 3,
+};
+
 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
 			 struct snd_kcontrol *kcontrol, int event);
 int dapm_clock_event(struct snd_soc_dapm_widget *w,

include/sound/soc.h

@@ -368,24 +368,6 @@
 #define SOC_ENUM_SINGLE_VIRT_DECL(name, xtexts) \
 	const struct soc_enum name = SOC_ENUM_SINGLE_VIRT(ARRAY_SIZE(xtexts), xtexts)
 
-/*
- * Bias levels
- *
- * @ON:      Bias is fully on for audio playback and capture operations.
- * @PREPARE: Prepare for audio operations. Called before DAPM switching for
- *           stream start and stop operations.
- * @STANDBY: Low power standby state when no playback/capture operations are
- *           in progress. NOTE: The transition time between STANDBY and ON
- *           should be as fast as possible and no longer than 10ms.
- * @OFF:     Power Off. No restrictions on transition times.
- */
-enum snd_soc_bias_level {
-	SND_SOC_BIAS_OFF = 0,
-	SND_SOC_BIAS_STANDBY = 1,
-	SND_SOC_BIAS_PREPARE = 2,
-	SND_SOC_BIAS_ON = 3,
-};
-
 struct device_node;
 struct snd_jack;
 struct snd_soc_card;