drm/xe/vf: Check if scheduler groups are enabled

drm/xe/vf: Check if scheduler groups are enabled

VF can check if PF has enabled scheduler groups with a dedicated KLV
query. If scheduler groups are enabled, MLRC queue registrations are
forbidden.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251218223846.1146344-20-daniele.ceraolospurio@intel.com