Add gralloc_perform enums definitions

Define enums for gralloc_perform function use cases.

Change-Id: I127ee7486b74d68b2f97e1670d9550144d6b7a3a
hwcomposer: Add HWC_BLIT compositiontype value

- HWC_BLIT this layer will be handled in the HWC, using a blit engine
- setting this will inform Surfaceflinger to flip FB_TARGET

Change-Id: I25d19ec41b57863d451c3e390109c912faf1381c