Add Screen Lock check to CTS preconditions

bug:23939594
Change-Id: If56ec646c27b3333cf719e9f01f955cf6a1aee21
diff --git a/tools/cts-preconditions/Android.mk b/tools/cts-preconditions/Android.mk
index 72b9520..daf35f4 100644
--- a/tools/cts-preconditions/Android.mk
+++ b/tools/cts-preconditions/Android.mk
@@ -25,7 +25,7 @@
 
 LOCAL_PROGUARD_ENABLED := disabled
 
-LOCAL_STATIC_JAVA_LIBRARIES := android-support-test
+LOCAL_STATIC_JAVA_LIBRARIES := android-support-test compatibility-device-preconditions
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)