dt-bindings: display/msm: dsi-controller-main: Add SM6375

Add the DSI host found on SM6375.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/541285/
Link: https://lore.kernel.org/r/20230411-topic-straitlagoon_mdss-v6-2-dee6a882571b@linaro.org


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>