Interface 'IBaz' and friends used by "hidl_test_java".

Change-Id: If49d996e34ba5aa48488e92e71234208001bfddb
diff --git a/tests/baz/1.0/IBazCallback.hal b/tests/baz/1.0/IBazCallback.hal
new file mode 100644
index 0000000..858e8c9
--- /dev/null
+++ b/tests/baz/1.0/IBazCallback.hal
@@ -0,0 +1,5 @@
+package android.hardware.tests.baz@1.0;
+
+interface IBazCallback {
+    heyItsMe(IBazCallback cb);
+};