arm64: dts: qcom: sm8250: add mi2s pinconfs

Add primary and tertinary mi2s pinconfs required to get I2S audio.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201202180741.16386-6-srinivas.kandagatla@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>