arm64: dts: qcom: switch to RPMPD_* indices

arm64: dts: qcom: switch to RPMPD_* indices

Use generic RPMPD_* defines for power domain instead of using
platform-specific defines.

Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251211-rework-rpmhpd-rpmpd-v2-1-a5ec4028129f@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>