ARM: dts: msm: enable explicit pipe priority for SDM855

Set pipe order version property in the device tree for SDM855,
allowing use cases with lowest priority pipe to be on the left.

Change-Id: Ie9333bb9bf42802a5a0a2fb181d47287b3d7e9dd
Signed-off-by: Alexander Beykun <abeykun@codeaurora.org>