soc: qcom: rpmpd: Bring all definitions to the top

Keep all definitions in one place in preparation for a cleanup to make
things tidier.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230313-topic-rpmpd-v3-2-06a4f448ff90@linaro.org