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
diff --git a/libhwcomposer/hwc_utils.h b/libhwcomposer/hwc_utils.h
index e64f89c..bfc4d26 100644
--- a/libhwcomposer/hwc_utils.h
+++ b/libhwcomposer/hwc_utils.h
@@ -142,6 +142,7 @@
 enum {
     HWC_COLOR_FILL = 0x00000008,
     HWC_FORMAT_RB_SWAP = 0x00000040,
+    HWC_VPU_PIPE = 0x00000200,
 };
 
 class LayerRotMap {