drm/amdgpu/vcn: enable TMZ support for vcn 4_0_5

TMZ support is enabled for vcn on GC IP 11_5_0

Signed-off-by: Saleemkhan Jamadar <saleemkhan.jamadar@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>