ASoC: zx: Add zx296702 SPDIF support

Add driver for zx296702 SPDIF controller

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/zte/Makefile b/sound/soc/zte/Makefile
new file mode 100644
index 0000000..fb3a4a0
--- /dev/null
+++ b/sound/soc/zte/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ZX296702_SPDIF)	+= zx296702-spdif.o