Add cts_v2 phony target for temporary build fix.

Change-Id: I770dc800dbcdff2c31e370410b32e2ee079f308b
diff --git a/core/tasks/cts.mk b/core/tasks/cts.mk
index 654d269..fdd9591 100644
--- a/core/tasks/cts.mk
+++ b/core/tasks/cts.mk
@@ -22,3 +22,6 @@
 .PHONY: cts
 cts: $(compatibility_zip)
 $(call dist-for-goals, cts, $(compatibility_zip))
+
+.PHONY: cts_v2
+cts_v2: cts