Unbanish memory screen and new UX

Give memory screen a makeover so that it looks nice enough to be
restored to its rightful home.

Bug: 20694769
Change-Id: I2f6933037b3fbbfb0d9fe5e3ca821ef59e171faa

src/com/android/settings/Utils.java

@@ -147,6 +147,8 @@ public final class Utils {
     private static final int SECONDS_PER_HOUR = 60 * 60;
     private static final int SECONDS_PER_DAY = 24 * 60 * 60;
 
+    public static final String OS_PKG = "os";
+
     private static SparseArray<Bitmap> sDarkDefaultUserBitmapCache = new SparseArray<Bitmap>();
 
     /**