hwc: Add support for copybit(C2D) composition

- Add CopybitEngine to hwc_context
- draw the layer on the HWC_FRAMEBUFFER_TARGET using
  copybit(c2d) if it qualifies for C2D composition.
- use fence returned from the copybit during c2d
  composition

Change-Id: I052da015cd031f7abd6411d83d7944c335caeff7
diff --git a/libgralloc/Android.mk b/libgralloc/Android.mk
index 159a252..f4e3834 100644
--- a/libgralloc/Android.mk
+++ b/libgralloc/Android.mk
@@ -35,7 +35,7 @@
 LOCAL_MODULE                  := libmemalloc
 LOCAL_MODULE_TAGS             := optional
 LOCAL_C_INCLUDES              := $(common_includes) $(kernel_includes)
-LOCAL_SHARED_LIBRARIES        := $(common_libs) libgenlock
+LOCAL_SHARED_LIBRARIES        := $(common_libs) libgenlock libqdutils
 LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdmemalloc\"
 LOCAL_ADDITIONAL_DEPENDENCIES := $(common_deps) $(kernel_deps)
 LOCAL_SRC_FILES               :=  ionalloc.cpp alloc_controller.cpp