This test fails occasionally on weekly builds of rocm. It looks like
the flag isn't even used outside of this test case (not even in docs).
Lets remove the test for this flag. Leaving the underlying code in place
in case we need to revive.
Change-Id: I4e0a36ad8a3e286f8ff64780583462711c73c1ba
Benjamin Welton
7d39ba7510