hwc: Add vpu client

Stub implementation of VPU in HWC.
This commit passes through binder calls from HWC
to the VPU library. It also has stub prepare/draw calls
in the VPU client object which can be used to configure
VPU in the composition cycle.

Change-Id: I2606f2884e870448d29ef26e02faac92e157e2c6
diff --git a/common.mk b/common.mk
index 13cd6ef..4aa56b2 100644
--- a/common.mk
+++ b/common.mk
@@ -10,7 +10,7 @@
 
 ifeq ($(TARGET_USES_POST_PROCESSING),true)
     common_flags     += -DUSES_POST_PROCESSING
-    common_includes += $(TARGET_OUT_HEADERS)/pp/inc
+    common_includes  += $(TARGET_OUT_HEADERS)/pp/inc
 endif
 
 common_header_export_path := qcom/display
@@ -36,6 +36,12 @@
     common_flags += -DMDSS_TARGET
 endif
 
+ifeq ($(call is-board-platform-in-list, mpq8092), true)
+    #XXX: Replace with check from MDP when available
+    common_flags += -DVPU_TARGET
+endif
+
+
 common_deps  :=
 kernel_includes :=