Include subdirectory Android.mks.

Change-Id: I6e6bc721dbcf127b52f2a60f255c9fc677d3be29
(cherry picked from commit c459bfea7e7be4343387dee137d4a5be9742fd91)
diff --git a/services/Android.mk b/services/Android.mk
index 8bd7629..5531592 100644
--- a/services/Android.mk
+++ b/services/Android.mk
@@ -43,3 +43,4 @@
 
 include $(BUILD_SHARED_LIBRARY)
 
+include $(call all-makefiles-under, $(LOCAL_PATH))