arm64: dts: qcom: sdm630: move DSI opp-table out of DSI node

The DSI OPP table on SDM630 is used by one DSI0, but on SDM660 is shared
by two nodes (DSI0 and DSI1), thus it should be rather in top-level, not
in DSI0.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230407192605.168666-1-krzysztof.kozlowski@linaro.org