arm64: qcom: msm8996.dtsi: Add Display nodes

Signed-off-by: Archit Taneja <architt@codeaurora.org>
[Removed instances of mmagic clocks;
Use qcom,msm8996-smmu-v2 bindings]
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>