arm64: dts: qcom: sc7180: Add rpmh power-domain node

Add the DT node for the rpmhpd power controller on SC7180 SoCs.

Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20191220064823.6115-3-sibis@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>