ARM: dts: qcom: apq8060-dragonboard: align MPP pin node names with DT schema

DT schema expects nodes ending with "pins:

  qcom-apq8060-dragonboard.dtb: mpps@50: cm3605-mpps-state: 'oneOf' conditional failed, one must be fixed:
    'mpp5' does not match any of the regexes: '-pins$', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230120174036.351937-1-krzysztof.kozlowski@linaro.org