[why]
Previous "less risky" implemenation of 3 tiered fallback is no longer necessary since
DMLv2 has gone through proper validation. v2 can now be used as the default and 1
level of fallback can be removed
[how]
remove previous workaround implemenation
Signed-off-by: Jun Lei <Jun.Lei@amd.com> Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>