ARM: dts: msm: add 4k panel support for SDM845

Certain CDPs will have 4k display on SDM845. This change adds
support for default display on such 4k display CDPs.

Change-Id: I183c1ad07469bd67440113195f09bc8056314249
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>