ASoC: msm8916-wcd-digital: add missing MIX2 path for RX1/2

This patch adds missing MIX2 path on RX1/2 which take IIR1 and
IIR2 as inputs.

Without this patch sound card fails to intialize with below warning:

 ASoC: no sink widget found for RX1 MIX2 INP1
 ASoC: Failed to add route IIR1 -> IIR1 -> RX1 MIX2 INP1
 ASoC: no sink widget found for RX2 MIX2 INP1
 ASoC: Failed to add route IIR1 -> IIR1 -> RX2 MIX2 INP1
 ASoC: no sink widget found for RX1 MIX2 INP1
 ASoC: Failed to add route IIR2 -> IIR2 -> RX1 MIX2 INP1
 ASoC: no sink widget found for RX2 MIX2 INP1
 ASoC: Failed to add route IIR2 -> IIR2 -> RX2 MIX2 INP1

Reported-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20191009111944.28069-1-srinivas.kandagatla@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>