arm64: dts: qcom: sm6125-sony-xperia: add missing SD CD GPIO functions

Add default GPIO function to SD card detect pins on SM6125 Sony Xperia,
as required by bindings:

  qcom/sm6125-sony-xperia-seine-pdx201.dtb: pinctrl@500000: sdc2-off-state: 'oneOf' conditional failed, one must be fixed:
    'pins' is a required property
    'function' is a required property
    'clk-pins', 'cmd-pins', 'data-pins', 'sd-cd-pins' do not match any of the regexes: 'pinctrl-[0-9]+'

Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220930192954.242546-10-krzysztof.kozlowski@linaro.org