display: makefile fixes

* Deprecate LOCAL_COPY_HEADERS on newer builds
* Use a display header export path instead
* Consolidate cflags

CRs-Fixed: 2023356
Change-Id: Ibb8900a77fc3fa47e6e54cd1649503eba12de8cd
diff --git a/sdm/libs/utils/Android.mk b/sdm/libs/utils/Android.mk
index f7f30a9..9b7f531 100644
--- a/sdm/libs/utils/Android.mk
+++ b/sdm/libs/utils/Android.mk
@@ -5,6 +5,7 @@
 LOCAL_MODULE                  := libsdmutils
 LOCAL_MODULE_TAGS             := optional
 LOCAL_C_INCLUDES              := $(common_includes)
+LOCAL_HEADER_LIBRARIES        := display_headers
 LOCAL_CFLAGS                  := -DLOG_TAG=\"SDM\" $(common_flags)
 LOCAL_SRC_FILES               := debug.cpp \
                                  rect.cpp \