Add MODULE_LICENSE_GPL.. for art/runtime/openjdkjvm.

This needs a companion makefile that declares a no-op module
so that the build system can leach of its LOCAL_PATH to collect
all subdirectory sources.

bug: 27160386

(cherry picked from commit 9a3a10ac819f456f7bcc626046342a845902fe96)

Change-Id: Ib11845c2172aad272c45ec2a3b4b2f7d508c1596
diff --git a/Android.mk b/Android.mk
index 4f73127..2e05d33 100644
--- a/Android.mk
+++ b/Android.mk
@@ -547,3 +547,5 @@
 art_dont_bother :=
 art_test_bother :=
 TEST_ART_TARGET_SYNC_DEPS :=
+
+include $(art_path)/runtime/openjdkjvm/Android.mk