ASoC: zx: Add ZTE zx296702 I2S DAI driver

Add ZTE zx296702 I2S interface DAI driver
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/zte/Kconfig

@@ -6,3 +6,12 @@ config ZX296702_SPDIF
 	help
 	  Say Y or M if you want to add support for codecs attached to the
 	  zx296702 spdif interface
+
+config ZX296702_I2S
+	tristate "ZX296702 i2s"
+	depends on SOC_ZX296702 || COMPILE_TEST
+	depends on COMMON_CLK
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y or M if you want to add support for codecs attached to the
+	  zx296702 i2s interface

sound/soc/zte/Makefile

 obj-$(CONFIG_ZX296702_SPDIF)	+= zx296702-spdif.o
+obj-$(CONFIG_ZX296702_I2S)	+= zx296702-i2s.o