arm64: dts: qcom: msm8916: Configure DSI port with labels

&dsi0 -> ports -> port@1 -> endpoint already has the "dsi0_out" label,
so we can use it for configuring instead of replicating the entire
node hierarchy. Looks like I missed that when converting the boards.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200915071221.72895-2-stephan@gerhold.net


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>