display: Enable clang for all display modules

Change-Id: I71e3fa3f7d44253b8e01d1eafe086b1898d65a8e
diff --git a/libgralloc/Android.mk b/libgralloc/Android.mk
index 412f1be..03da814 100644
--- a/libgralloc/Android.mk
+++ b/libgralloc/Android.mk
@@ -23,7 +23,8 @@
 LOCAL_C_INCLUDES              := $(common_includes) $(kernel_includes)
 LOCAL_SHARED_LIBRARIES        := $(common_libs) libmemalloc libqdMetaData
 LOCAL_SHARED_LIBRARIES        += libqdutils libGLESv1_CM
-LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdgralloc\"
+LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdgralloc\" -Wno-sign-conversion
+LOCAL_CLANG                   := true
 LOCAL_ADDITIONAL_DEPENDENCIES := $(common_deps) $(kernel_deps)
 LOCAL_SRC_FILES               := gpu.cpp gralloc.cpp framebuffer.cpp mapper.cpp
 LOCAL_COPY_HEADERS_TO         := $(common_header_export_path)
@@ -38,7 +39,8 @@
 LOCAL_MODULE_TAGS             := optional
 LOCAL_C_INCLUDES              := $(common_includes) $(kernel_includes)
 LOCAL_SHARED_LIBRARIES        := $(common_libs) libqdutils libdl
-LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdmemalloc\"
+LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdmemalloc\" -Wno-sign-conversion
+LOCAL_CLANG                   := true
 LOCAL_ADDITIONAL_DEPENDENCIES := $(common_deps) $(kernel_deps)
 LOCAL_SRC_FILES               := ionalloc.cpp alloc_controller.cpp
 LOCAL_COPY_HEADERS            := alloc_controller.h memalloc.h