ARM: dts: msm: update the SDE device tree for sdm855

These changes are required as part of the fast-forward of the
original SDE snapshot that was ported from the 4.9 kernel.

Change-Id: Ibd647e36cdb5a9bc5d7fa7e4f4544d29406241e8
Signed-off-by: Steve Cohen <cohens@codeaurora.org>