drm/amdgpu: enable tmz on renoir asics

The tmz functions are verified on renoir chips as well. So enable it by
default.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Tested-by: Lang Yu <Lang.Yu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>