arm64: dts: qcom: sm6125: Add RPMPD node

Add RPM Power Distribution node for sm6125 SoC.

Signed-off-by: Martin Botka <martin.botka@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211130212332.25401-3-martin.botka@somainline.org