remove VTS_CONFIG_SRC_DIR as no more used

Test: mma
Bug: 36658596
Change-Id: I6508d9a5a24ef787a47f6293f1af5cb400e36b6a
diff --git a/power/V1_3/target/Android.mk b/power/V1_3/target/Android.mk
index 812df84..f81b1ef 100644
--- a/power/V1_3/target/Android.mk
+++ b/power/V1_3/target/Android.mk
@@ -19,5 +19,4 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := VtsHalPowerV1_3Target
-VTS_CONFIG_SRC_DIR := testcases/hal/power/V1_3/target
 include test/vts/tools/build/Android.host_config.mk