Enable java backend for UpdateEngineStable

Test: m libupdate_engine_stable-V1-java
Bug: 317914533
Change-Id: I8f152764f0691d63221ef3f4e647631dbca2994a
diff --git a/stable/Android.bp b/stable/Android.bp
index 73a9c37..54ae35d 100644
--- a/stable/Android.bp
+++ b/stable/Android.bp
@@ -40,7 +40,7 @@
             enabled: true,
         },
         java: {
-            enabled: false,
+            enabled: true,
         },
         ndk: {
             enabled: true,