arm64: dts: qcom: sm8350: move DPU opp-table to its node

The Qualcomm MDSS bindings expect that DPU opp-table is defined within
DPU node:

  sm8350-hdk.dtb: display-subsystem@ae00000: Unevaluated properties are not allowed ('opp-table' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20231107103540.27353-3-krzysztof.kozlowski@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>