drm_hwcomposer: Use HW overlay planes

Now that buffers are sticking around while hwc wants them,
turn on use of HW overlay planes in the drm compositor.

Change-Id: I05fb0bfa54933c009168bfc7292d134e5e987542
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmcomposition.cpp b/drmcomposition.cpp
index 8fcb12d..07e08da 100644
--- a/drmcomposition.cpp
+++ b/drmcomposition.cpp
@@ -29,7 +29,7 @@
 
 namespace android {
 
-static const bool kUseOverlayPlanes = false;
+static const bool kUseOverlayPlanes = true;
 
 DrmCompositionLayer::DrmCompositionLayer() : crtc(NULL), plane(NULL) {
   memset(&layer, 0, sizeof(layer));