Overview - Remove the space withheld for proactive chips

Remove the space in the ui that was being used for chips.
Centralize some of the logic around calculating the action margins to aid
that.

Bug: 179922117
Test: Local build and flash and run
Change-Id: Icd2f894c858fab475c5411f3f7c412b899d5b220

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

@@ -253,6 +253,7 @@ public abstract class BaseQuickstepLauncher extends Launcher
                 new SplitSelectStateController(mHandler, SystemUiProxy.INSTANCE.get(this))
         );
         overviewPanel.init(mActionsView, mSplitPlaceholderView);
+        mActionsView.setDp(getDeviceProfile());
         mActionsView.updateVerticalMargin(SysUINavigationMode.getMode(this));
 
         mAppTransitionManager = new QuickstepTransitionManager(this);