ASoC: qdsp6: q6afe-dai: Add missing Slimbus0 audio route

For some reason SLIMBus RX0 playback is not added to audio routes.
This patch adds the missing route.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190703123102.12626-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>