arm64: dts: qcom: sm8350: Replace integers with rpmpd defines

Replace &rpmhpd power domain integers with their respective defines
in order to improve legibility.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220706152830.2021197-1-robert.foss@linaro.org