drm/amdgpu: change code name to ip version for tmz set

Use IP version rather then code name of IPs for
tmz set.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>