dt-bindings: power: rpmpd: Add sc8280xp RPMh power-domains

The sc8280xp has 13 power-domains controlled through the RPMh, document
the compatible and provide definitions for the power-domains - and their
active-only variants where applicable.

The SA8540p differs slightly in the power domains exposed, so add a
separate compatible for this, but reuse the constants to allow sharing
the DeviceTree source.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220426233508.1762345-2-bjorn.andersson@linaro.org