drm/xe/xe2: Add MCR register steering for media GT

drm/xe/xe2: Add MCR register steering for media GT

Xe2 media has a few types of MCR registers, but all except for "GPMXMT"
can safely steer to instance 0,0.  GPMXMT follows the same rules that
MTL's OADDRM ranges did, so it can re-use the same enum value.

Bspec: 71186
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>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>