drm/xe/xe2: Add GT topology readout

drm/xe/xe2: Add GT topology readout

Xe2 platforms have three DSS fuse registers for both geometry and
compute.

Bspec: 67171, 67537, 67401, 67536
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>