Make safeunion@1.0 test HAL Java-compatible

This change removes Java-incompatible types (memory, handle) from the
safeunion@1.0 test HAL. Moving forward, the idea is to keep this HAL
Java & C++-friendly, and create another version (likely safeunion@2.0)
to regress on C++-only types; tracked by b/110269925.

Bug: n/a
Test: Ran the existing hidl_test suite
Change-Id: Ic7458c3f5b571e77e5f894a9854a2b201f53fe18
diff --git a/tests/safeunion/1.0/Android.bp b/tests/safeunion/1.0/Android.bp
index 4c6631e..ede8401 100644
--- a/tests/safeunion/1.0/Android.bp
+++ b/tests/safeunion/1.0/Android.bp
@@ -10,6 +10,6 @@
     interfaces: [
         "android.hidl.base@1.0",
     ],
-    gen_java: false,
+    gen_java: true,
 }