ASoC: remove zte zx dangling kconfig

In commit dc98f1d6 we removed the zte zx sound drivers but there
was a dangling Kconfig left around for the codec so fix this.

Fixes: dc98f1d6 ("ASoC: remove zte zx drivers")
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Brown <broonie@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210627105955.3410015-1-pbrobinson@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -1813,11 +1813,6 @@ config SND_SOC_ZL38060
 	  which consists of a Digital Signal Processor (DSP), several Digital
 	  Audio Interfaces (DAIs), analog outputs, and a block of 14 GPIOs.
 
-config SND_SOC_ZX_AUD96P22
-	tristate "ZTE ZX AUD96P22 CODEC"
-	depends on I2C
-	select REGMAP_I2C
-
 # Amp
 config SND_SOC_LM4857
 	tristate