msm_fb: display: Add pre-multiplied alpha support for MDP4.

MDP4 blend logic differs from GPU blend implementation as MDP4
does not differentiate between pre-multiplied alpha layers and
non pre-multiplied alpha layers. Check layers for pre-multiplied
alpha and change blend logic accordingly.

CRs-Fixed: 355755
CRs-Fixed: 361729
Change-Id: Id8253d3888f1ebbadba1b6bbd87e7d98bac22da7
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>
1 file changed