Use core-oj alongside core-libart wherever required.

With some core classes moved to separate core-oj jar
we need to use the new jar.

(cherry picked from commit 96a54c42b4cee793a0d1174082f1d94c1342d1b3)

Change-Id: I693babc2a4d8ad16005f6e7b4a65866996be6300
diff --git a/Android.mk b/Android.mk
index ff8dfaf..40d72ed 100644
--- a/Android.mk
+++ b/Android.mk
@@ -18,7 +18,7 @@
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_JAVA_RESOURCE_DIRS := res
 LOCAL_MODULE := nist-pkix-tests
-LOCAL_JAVA_LIBRARIES := core-libart core-junit
+LOCAL_JAVA_LIBRARIES := core-oj core-libart core-junit
 LOCAL_NO_STANDARD_LIBRARIES := true
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 include $(BUILD_STATIC_JAVA_LIBRARY)