ARM: dts: msm: alter phy timings for 4k panel for sdm855

Alter phy timings for 4k video mode and command
mode panels as per latest hardware recommended
settings.

Change-Id: I8866cccfd8fc9c62d0ccba6b8b916703d0e8affd
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>