Revert "ARM: dts: msm: disable partial update for msm8992"

This reverts commit fad7e09e.

Enable partial update support for smart panels as we are
supporting partial update with ping pong split.

Change-Id: Id77d75139cbeb3d49f4325695a491f7c4979d2d6
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>