arm64: dts: qcom: sm8350: use qcom,sm8350-dsi-ctrl compatibles

Add the per-SoC (qcom,sm8350-dsi-ctrl) compatible strings to DSI nodes
to follow the pending DSI bindings changes.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230118032024.1715857-1-dmitry.baryshkov@linaro.org