ASoC: tas571x: added support for TAS5721

This adds support for TAS5721.

Signed-off-by: Petr Kulhavy <petr@barix.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 649e92a..c011f07 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -737,7 +737,7 @@
 	depends on I2C
 
 config SND_SOC_TAS571X
-	tristate "Texas Instruments TAS5711/TAS5717/TAS5719 power amplifiers"
+	tristate "Texas Instruments TAS5711/TAS5717/TAS5719/TAS5721 power amplifiers"
 	depends on I2C
 
 config SND_SOC_TFA9879