Adding handle types to Java-compatible test HALs

This change adds HIDL handle types to the baz@1.0 and safeunion@1.0 test
HALs to exercise native handles in Java.

Bug: 35098567
Test: Ran the hidl_test (C++ and Java) suites
Change-Id: Iddf1c269cbdc68ce337f1e787570f3810f7baad2
diff --git a/tests/baz/1.0/IBaz.hal b/tests/baz/1.0/IBaz.hal
index 00fe568..8118d8b 100644
--- a/tests/baz/1.0/IBaz.hal
+++ b/tests/baz/1.0/IBaz.hal
@@ -68,6 +68,11 @@
         bitfield<BitField> bf;
     };
 
+    struct MyHandle {
+        handle h;
+        int32_t guard;
+    };
+
     struct StructWithInterface {
         int32_t number;
         int8_t[7] array;