Replace core-junit with legacy-test

m -j32 checkbuild cts droid
adb reboot bootloader
fastboot flashall -w
cts-tradefed run cts -m CtsLibcoreTestCases

Bug: 30188076
Test: As above
Change-Id: I4147959de045143002d280c9a22539e8c99e0358
diff --git a/benchmarks/Android.mk b/benchmarks/Android.mk
index 22d0d26..c48c224 100644
--- a/benchmarks/Android.mk
+++ b/benchmarks/Android.mk
@@ -28,7 +28,7 @@
   core-oj \
   core-libart \
   conscrypt \
-  core-junit \
+  legacy-test \
   bouncycastle \
   framework
 LOCAL_MODULE_TAGS := tests