Add devices tree nodes describing display hardware on SM8550:
- Display Clock Controller
- MDSS
- MDP
- two DSI controllers and DSI PHYs

This does not provide support for DP controllers present on the SM8550.
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230104-topic-sm8550-upstream-dts-display-v4-1-1729cfc0e5db@linaro.org