dt-bindings: power: Add rpm power domain bindings for SM8350

Add RPM power domain bindings for the SM8350 SoC

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20210210104257.339462-1-vkoul@kernel.org


[bjorn: Added dt-bindings include file changes from the driver patch]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>