As the name says we only need one global instance of ttm_bo_global.

Just use a single exported instance which is save to initialize multiple times.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>