disp: msm: sde: add dim layer check during secure transition

During secure UI transition, if planes are not being staged
in last non-secure commit, dim layer should be staged at
highest blend stage due to topology lockdown. This change
handles atomic check in such scenarios.

Change-Id: I0bbc862e4989e72f966a35d45537adc2d3943fb7
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>