[ALPS08739152] disp: skip cwb for sec scenario

[Description]
cwb can not be marked as secure if security layer is composed
by GPU

[Test]
Build pass and pass self-sanity test

MTK-Commit-Id: 09f629f4b4c380ba6938bb4e4fa21a2f8af11a6c

Signed-off-by: Bo Liang <ot_bo.liang@mediatek.com>
CR-Id: ALPS08739152
Feature: display_mobile
Change-Id: I40bd6ea3d0804e8609742166aec0357d4277fbf1