arm64: dts: qcom: sm8250: add lpass lpi pin controller node

Add LPASS LPI pinctrl node required for Audio functionality on RB5.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201202180741.16386-4-srinivas.kandagatla@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>