ASoC: rt5665: remove rt5668 support

Remove rt5668 support from rt5665 codec driver since rt5668 will
not go into mass production.
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rt5665.txt

-RT5665/RT5666/RT5668 audio CODEC
+RT5665/RT5666 audio CODEC
 
 This device supports I2C only.
 
 Required properties:
 
-- compatible : One of "realtek,rt5665", "realtek,rt5666" or "realtek,rt5668".
+- compatible : One of "realtek,rt5665", "realtek,rt5666".
 
 - reg : The I2C address of the device.
 

sound/soc/codecs/rt5665.c

@@ -4826,9 +4826,6 @@ static int rt5665_i2c_probe(struct i2c_client *i2c,
 	case 0x0:
 		rt5665->id = CODEC_5666;
 		break;
-	case 0x6:
-		rt5665->id = CODEC_5668;
-		break;
 	case 0x3:
 	default:
 		rt5665->id = CODEC_5665;
@@ -4955,7 +4952,6 @@ static void rt5665_i2c_shutdown(struct i2c_client *client)
 static const struct of_device_id rt5665_of_match[] = {
 	{.compatible = "realtek,rt5665"},
 	{.compatible = "realtek,rt5666"},
-	{.compatible = "realtek,rt5668"},
 	{},
 };
 MODULE_DEVICE_TABLE(of, rt5665_of_match);
@@ -4965,7 +4961,6 @@ MODULE_DEVICE_TABLE(of, rt5665_of_match);
 static const struct acpi_device_id rt5665_acpi_match[] = {
 	{"10EC5665", 0,},
 	{"10EC5666", 0,},
-	{"10EC5668", 0,},
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, rt5665_acpi_match);

sound/soc/codecs/rt5665.h

@@ -1978,7 +1978,6 @@ enum {
 enum {
 	CODEC_5665,
 	CODEC_5666,
-	CODEC_5668,
 };
 
 /* filter mask */