hwc: vpu: Added a new flag to indicate VPU pipe

Added a new layer flag: HWC_VPU_PIPE to indicate that the layer
will be drawn by VPU. There is a corresponding MDP pipe
flag: MDP_VPU_PIPE, which should be set for the VPU layers to
indicate the layer will be drawn by VPU, so that MDP driver does
the appropriate settings to allow this process.

Change-Id: I61270aca633bb831bf34d413877bf925a3d2ac37
3 files changed