ASoC: zte: spdif: correct ZX_SPDIF_CLK_RAT define

The macro ZX_SPDIF_CLK_RAT should be 2 instead of 4.  With this
fix, we can get correct audio output on HDMI through SPDIF interface.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Acked-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/zte/zx-spdif.c

@@ -71,7 +71,7 @@
 #define ZX_VALID_RIGHT_TRACK		(2 << 0)
 #define ZX_VALID_TRACK_MASK		(3 << 0)
 
-#define ZX_SPDIF_CLK_RAT		(4 * 32)
+#define ZX_SPDIF_CLK_RAT		(2 * 32)
 
 struct zx_spdif_info {
 	struct snd_dmaengine_dai_dma_data	dma_data;