arm64: dts: qcom: sdm660: move SDHC2 card detect pinconf to board files

This results in dts duplication, but per mutual agreement card detect
pin configuration belongs to the board files. Move it from the SoC
dtsi to the board DT files.

Suggested-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220521202708.1509308-10-dmitry.baryshkov@linaro.org