HIDL: IFoo mark @SensitiveData

Marking this annotation for use in hidl_test, so that we make sure to
exercise it.

Bug: 171501998
Test: hidl_test
Change-Id: Ia40e5fdf26804773c1450d181723cc7b97bf6a81
diff --git a/tests/foo/1.0/IFoo.hal b/tests/foo/1.0/IFoo.hal
index 4c54427..e242616 100644
--- a/tests/foo/1.0/IFoo.hal
+++ b/tests/foo/1.0/IFoo.hal
@@ -21,6 +21,7 @@
 import ISimple;
 import ITheirTypes.FloatArray;
 
+@SensitiveData // for test
 interface IFoo {
 
     enum SomeBaseEnum : uint8_t {