core: add support for translucent volume panel

Add support for display the volume panel in translucent mode

Patchset 4: Make it depends to high-end graphics flag

Change-Id: I4f21a6cc88282789072a0e71ae696b754a5e083e
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Revert "Fix stencil buffer bug."

This reverts commit ea327b48b495168872c1c758c7c744890496650f.

Change-Id: I8e4b8b4c6cf48930907cdb52c95135dd6f338af2
Display: Dirty region propagation

Pass Dirty region values from HW renderer to Surface Texture.

Change-Id: Ibd121ed398a1319d3daf26f9fd39a03323bba666