ARM: dts: qcom: apq8074-dragonboard: enable DSI panel

Enable MDSS, GPU and DSI panel output on the APQ8074 dragonboard.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230507190735.2333145-5-dmitry.baryshkov@linaro.org