ASoC: rt5670: Add disabled item in dmic pin enum

Currently, we will configure dmic related pin definition if pdata.dmic_en
is true. However, there is no disable option in the enum. So, any dmic is
used, all 3 dmic related pins will be configured. It may cause unexpected
pin definition. This patch adds a disable item for each dmic enum and
take it as default. So the driver will not set the pin configuration if
we don't set dmicx_data_pin in platform data.
Signed-off-by: NBard Liao <bardliao@realtek.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/rt5670.h

@@ -1967,17 +1967,20 @@ enum {
 };
 
 enum {
+	RT5670_DMIC1_DISABLED,
 	RT5670_DMIC_DATA_GPIO6,
 	RT5670_DMIC_DATA_IN2P,
 	RT5670_DMIC_DATA_GPIO7,
 };
 
 enum {
+	RT5670_DMIC2_DISABLED,
 	RT5670_DMIC_DATA_GPIO8,
 	RT5670_DMIC_DATA_IN3N,
 };
 
 enum {
+	RT5670_DMIC3_DISABLED,
 	RT5670_DMIC_DATA_GPIO9,
 	RT5670_DMIC_DATA_GPIO10,
 	RT5670_DMIC_DATA_GPIO5,