arm64: dts: qcom: pm8994: fix mpps device tree node

Add missing "qcom,spmi-mpp" to the compatible list as required by the
node description. Also add gpio-ranges property to mpps device tree
node, adding the mapping between pinctrl and GPIO pins.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211008012524.481877-12-dmitry.baryshkov@linaro.org