ASoC: zte: spdif and i2s drivers are not zx296702 specific

ZTE ZX SPDIF and I2S drivers can work on not only ZX296702 but also
other ZTE ZX family SoCs like ZX296718, which is an arm64 platform.
Let's make a few renaming and tweak the Kconfig a bit to get the drivers
available for other ZTE ZX platforms.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Reviewed-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/zte/Kconfig

-config ZX296702_SPDIF
-	tristate "ZX296702 spdif"
-	depends on SOC_ZX296702 || COMPILE_TEST
+config ZX_SPDIF
+	tristate "ZTE ZX SPDIF Driver Support"
+	depends on ARCH_ZX || 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 spdif interface
+	  ZTE ZX SPDIF interface
 
-config ZX296702_I2S
-	tristate "ZX296702 i2s"
-	depends on SOC_ZX296702 || COMPILE_TEST
+config ZX_I2S
+	tristate "ZTE ZX I2S Driver Support"
+	depends on ARCH_ZX || 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
+	  ZTE ZX I2S interface

sound/soc/zte/Makefile

-obj-$(CONFIG_ZX296702_SPDIF)	+= zx296702-spdif.o
-obj-$(CONFIG_ZX296702_I2S)	+= zx296702-i2s.o
+obj-$(CONFIG_ZX_SPDIF)	+= zx-spdif.o
+obj-$(CONFIG_ZX_I2S)	+= zx-i2s.o