drm/amdgpu:disable XGMI TA unload for A+A aldebaran

In gpu reset, XGMI TA unload will cause gpu hang.
Skip it on A+A aldebaran.

Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>