hwc2: Implement IDisplayConfig HIDL service.

- Add IDisplayConfig service in composer process.
- Add DisplayConfig wrapper to abstract
  IDisplayConfig interfaces.

CRs-Fixed: 2036340
Change-Id: I54535e7224ee842b761509268ebaa2e8425bc8d7
diff --git a/Android.mk b/Android.mk
index 226e8a0..1a285bf 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 gpu_tonemapper libdrmutils
+                    $(sdm-libs)/hwc $(sdm-libs)/hwc2 gpu_tonemapper libdrmutils libdisplayconfig
 endif
 
 ifneq ($(TARGET_USES_GRALLOC1), true)