remove VTS_CONFIG_SRC_DIR as no more used

Test: mma
Bug: 36658596
Change-Id: I151016325a93e937707cdb00965048d10489151e
diff --git a/tests/Android.mk b/tests/Android.mk
index 1d246a4..c6b6026 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -34,5 +34,4 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := VtsFmqUnitTests
-VTS_CONFIG_SRC_DIR := system/libfmq/tests
 -include test/vts/tools/build/Android.host_config.mk