Empty interface IQuux which is completely unrelated to IBase and IBaz.

Used to verify that it's not possible to obtain an IQuux interface from an
IBase/IBaz binder, i.e. IHwBinder.asInterface(...) properly respects the
interfaceChain.

Bug: 36749201
Test: hidl_test_java
Change-Id: I84419e78db22acdfcc7d9972d22d139641469bde