dt-bindings: display: qcom,sm8550-mdss: explicitly document mdp0-mem and cpu-cfg interconnect paths

The mdp1-mem is not supported on the SM8550 SoCs, and having maxItems=2
makes the bindings not clear if mdp0-mem/mdp1-mem or mdp0-mem/cpu-cfg is
required, so explicitly document the mdp0-mem/cpu-cfg interconnect and
add the cpu-cfg path in the example.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/637050/
Link: https://lore.kernel.org/r/20250213-topic-sm8x50-mdss-interconnect-bindings-fix-v4-1-3fa0bc42dd38@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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