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: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>