Update overview actions alignment

- Align overview actions to the top with a defined margin below task thumbnail, except for vertical bar layout
- In modal state, use task view's bottom as pivot, and expand using all the space about pivot
- Simplified overview actions margin calculation and moved some logic to DeviceProfile

Bug: 209981696
Test: manual on various devices
Change-Id: I4c96cb02c6f3d6adf30633ddeb883bc4eec16f36

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -296,7 +296,7 @@ public abstract class BaseQuickstepLauncher extends Launcher {
                 new SplitSelectStateController(this, mHandler, getStateManager(),
                         getDepthController());
         overviewPanel.init(mActionsView, controller);
-        mActionsView.setDp(getDeviceProfile());
+        mActionsView.updateDimension(getDeviceProfile(), overviewPanel.getLastComputedTaskSize());
         mActionsView.updateVerticalMargin(DisplayController.getNavigationMode(this));
 
         mAppTransitionManager = new QuickstepTransitionManager(this);