gpu_tonemapper: Include gpu tonemapper

GPU tonemapper library which is used by HWC to tone
map the layers from one Gamut to another based on the
3D LUT.

Change-Id: Iccaa38e40989e832fd3891a24eca494aba696d9a
Crs-fixed: 1094964
diff --git a/Android.mk b/Android.mk
index 60a48f5..6eef2fc 100644
--- a/Android.mk
+++ b/Android.mk
@@ -3,7 +3,7 @@
 
 ifneq ($(TARGET_IS_HEADLESS), true)
     display-hals += libcopybit liblight libmemtrack hdmi_cec \
-                    $(sdm-libs)/hwc $(sdm-libs)/hwc2
+                    $(sdm-libs)/hwc $(sdm-libs)/hwc2 gpu_tonemapper
 endif
 
 ifneq ($(TARGET_USES_GRALLOC1), true)