dt-bindings: display: msm: sm8350-mdss: Fix DSI compatible

The DSI compatible changed between patchset revisions, but that wasn't
reflected in the bindings. Fix it.

Fixes: 430e11f4 ("dt-bindings: display: msm: Add qcom, sm8350-mdss binding")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: David Heidelberg <david@ixit.cz>
Patchwork: https://patchwork.freedesktop.org/patch/528037/
Link: https://lore.kernel.org/r/20230321213557.1737905-1-konrad.dybcio@linaro.org


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