hwc: Avoid partial frame update on secure display

On configuring for secure display, MDP switches to secured
memory bank. Invoking any more DCS panel commands which
follows non-secure path will cause XPU violation. So its
necessary for HWC to turn off partial update to avoid DCS
commands due to ROI change.

Change-Id: Ibcc24d34d3cb825b027c116ac6a4d841d9cb9b70

msm8226/libhwcomposer/hwc_mdpcomp.cpp

@@ -1137,6 +1137,8 @@ bool MDPComp::canPartialUpdate(hwc_context_t *ctx,
             mDpy ) {
         return false;
     }
+    if(ctx->listStats[mDpy].secureUI)
+        return false;
     return true;
 }