Move TestCommon sources into the test/src directory (1/2)

Bug 30759296

Change-Id: I1fcb3c70b4cc7fb1c0041dc1762ce06495045673
diff --git a/tests/Android.mk b/tests/Android.mk
index c1a5eb4..f018d3e 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -7,7 +7,7 @@
 
 LOCAL_STATIC_JAVA_LIBRARIES := android-support-test
 
-src_dirs := src ../TestCommon/src
+src_dirs := src
 res_dirs := res res-common
 
 LOCAL_SRC_FILES := $(call all-java-files-under, $(src_dirs))