dt-bindings: power: qcom,rpmpd: add missing RPMH levels

There are a lot of RPMh levels that we haven't included yet.. some
sadly turned out to be necessary, add them!

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230517-topic-kailua-rpmhpd-v2-1-3063ce19c491@linaro.org