PWM: disable HW overlays for PIE

SurfaceFlinger wont wake up the GPU in SysUI's fullscreen state,
probably because it does not occupy any tangible region. That sets poor
PIE into software rendering, which has bad effects on transparency and
mdp compositioning. Disabling HW overlays as long as PIE is active seems
like a good alternative for now.

Change-Id: Ie7ed720edc5bbdd0cfb79c34a22996cf15fcd79b
add tabUI to HW overlays

Change-Id: Ib352cb05c0dca1155b3d1c8fe3da4b16de898e44
PWM: check for expanded desktop on boot

Change-Id: I8f3883019b60138d8937bd85adc9231b0e18c595
PIE: fix stuck pixel on screen redraw

Reverts: PWM: disable HW overlays for PIE de1cb4e
Uses a dummmy view to force the screen to be redrawn on screen update

Change-Id: Ia12e596f81583a3b6be1bef64ae9d46b32d410d2