arm64: dts: qcom: sm6125: Add display hardware nodes

arm64: dts: qcom: sm6125: Add display hardware nodes

Add the DT nodes that describe the MDSS hardware on SM6125, containing
one MDP (display controller) together with a single DSI and DSI PHY.  No
DisplayPort support is added for now.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Link: https://lore.kernel.org/r/20230723-sm6125-dpu-v4-16-a3f287dd6c07@somainline.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>