soc: qcom: rpmhpd: Add SM8450 power domains

Add the power domains exposed by RPMH in the Qualcomm SM8450 platform.
Unlike previous generations CX domain is not a child of MX domain.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211201072745.3969077-7-vkoul@kernel.org