APU fb offset is set by sbios, which is different with DGPU.
Signed-off-by: NChunming Zhou <David1.Zhou@amd.com>
Reviewed-by: NKen Wang <Qingqing.Wang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>