Remove some more dead-code from old split impl

Removed moveTasksToFullscreenStack (only a small piece of it
was used by pip, so just localized it).

Remove stack creation/reparenting from resizeTask since modes
don't work like that anymore.

Removed some always-false parameters in AS.setWindowingMode

Bug: 133381284
Test: tests pass
Change-Id: I22e846250196eb93b480a05bed1f66d34b51a092
diff --git a/services/core/java/com/android/server/wm/TaskDisplayArea.java b/services/core/java/com/android/server/wm/TaskDisplayArea.java
index 1bc7244..7fb6f6f 100644
--- a/services/core/java/com/android/server/wm/TaskDisplayArea.java
+++ b/services/core/java/com/android/server/wm/TaskDisplayArea.java
@@ -936,9 +936,7 @@
             }
         } else {
             addStack(stack, onTop ? POSITION_TOP : POSITION_BOTTOM);
-            stack.setWindowingMode(windowingMode, false /* animate */, false /* showRecents */,
-                    false /* enteringSplitScreenMode */, false /* deferEnsuringVisibility */,
-                    true /* creating */);
+            stack.setWindowingMode(windowingMode, true /* creating */);
         }
         return stack;
     }
@@ -1148,7 +1146,7 @@
             for (int i = getStackCount() - 1; i >= 0; --i) {
                 final ActivityStack stack = getStackAt(i);
                 // Collect the root tasks that are currently being organized.
-                if (stack.isOrganized()) {
+                if (stack.mCreatedByOrganizer) {
                     for (int k = stack.getChildCount() - 1; k >= 0; --k) {
                         final ActivityStack childStack = (ActivityStack) stack.getChildAt(k);
                         if (childStack.getActivityType() == activityType) {