support IB test on dec/enc ring
disable ring test on dec/enc ring (MMSCH limitation)

v2: squash in unused variable warning fix
Singed-off-by: Ndarlington Opara <darlington.opara@amd.com>
Signed-off-by: NJinage Zhao <jiange.zhao@amd.com>
Signed-off-by: NMonk Liu <Monk.Liu@amd.com>
Acked-by: NLeo Liu <leo.liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>