Reducing HW layer usage on non-large devices

- On phones, we set HW layers on the workspace items themselves, which doesn't cost any performance
- On tablets this approach costs 5-6 FPS in the worst case when swiping pages so we stay with the old approach of enabling HW layers on the entire workspace page

Change-Id: I3626ea14844c3e4444cf79232dbde396840b1804
1 file changed