SF: Consolidate layer-to-output filtering

Add ui::LayerFilter for less repetitive CE plumbing. Make ui::LayerStack
a type, and (unlike the alias) use it everywhere. Remove redundant state
in CE's DisplayCreationArgs.

Bug: 182939859
Test: Display cutout is excluded in screenshots.
Test: libcompositionengine_test
Test: libsurfaceflinger_unittest
Test: SurfaceFlinger_test
Test: libgui_test
Change-Id: Ib854d354af7aef7168001c34297e875b71d53622
diff --git a/services/surfaceflinger/tests/LayerUpdate_test.cpp b/services/surfaceflinger/tests/LayerUpdate_test.cpp
index ee4d367..e1a7ecc 100644
--- a/services/surfaceflinger/tests/LayerUpdate_test.cpp
+++ b/services/surfaceflinger/tests/LayerUpdate_test.cpp
@@ -63,7 +63,7 @@
         TransactionUtils::fillSurfaceRGBA8(mSyncSurfaceControl, 31, 31, 31);
 
         asTransaction([&](Transaction& t) {
-            t.setDisplayLayerStack(display, 0);
+            t.setDisplayLayerStack(display, ui::DEFAULT_LAYER_STACK);
 
             t.setLayer(mBGSurfaceControl, INT32_MAX - 2).show(mBGSurfaceControl);