ARM: dts: qcom: add DT node for Display Port driver for SDM845

Add the device tree properties to enable support for Display Port
driver on SDM845. This includes the various register offsets,
clocks, GPIOs, regulators and other DP specific properties.

Change-Id: Ib9e600dd5a381563e874ca9c5b530cacbfda8b2e
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>