Add compatible and constants for the power domains exposed by the
QCM2290 RPM.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211108134442.30051-3-shawn.guo@linaro.org