disp: msm: sde: add trusted UI support for SDE

Extends atomic check to validate TUI transition request aginst
SDE and non-SDE client states. Triggers HW assignment after
making sure current frame is  completely flushed out of HW
pipeline. Initiate the acquire after TUI end after restoring
the software states.

Change-Id: I6ceccd44c18526ff818723b5631b66af3ff083c1
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>