Turning on hardware layers for the workspace

- Obsoletes need for CachedViewGroup and CachedTextView on workspace as well

Bug #3413433
diff --git a/src/com/android/launcher2/CellLayout.java b/src/com/android/launcher2/CellLayout.java
index 6767cf1..b27770c 100644
--- a/src/com/android/launcher2/CellLayout.java
+++ b/src/com/android/launcher2/CellLayout.java
@@ -50,7 +50,7 @@
 
 import java.util.Arrays;
 
-public class CellLayout extends CachedViewGroup {
+public class CellLayout extends ViewGroup {
     static final String TAG = "CellLayout";
 
     private int mCellWidth;