Migrate Libcore tests to CTSv2.

Bug:21762834
Change-Id: Ib2821a7f5d6a7d0012e6963bf1c8e3717828ccf7
diff --git a/tools/cts-tradefed/Android.mk b/tools/cts-tradefed/Android.mk
index ee54b65..2f743e6 100644
--- a/tools/cts-tradefed/Android.mk
+++ b/tools/cts-tradefed/Android.mk
@@ -16,8 +16,7 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES := $(call all-java-files-under, src)
-LOCAL_SRC_FILES += $(call all-java-files-under, ../../common/host-side/tradefed/src)
+LOCAL_SRC_FILES := $(call all-java-files-under, ../../common/host-side/tradefed/src)
 
 LOCAL_JAVA_RESOURCE_DIRS := res
 LOCAL_JAVA_RESOURCE_DIRS += ../../common/host-side/tradefed/res