drm/xe/pf: Prep for multiple exec quantums and preemption timeouts

drm/xe/pf: Prep for multiple exec quantums and preemption timeouts

Each scheduler group can be independently configured with its own exec
quantum and preemption timeouts. The existing KLVs to configure those
parameters will apply the value to all groups (even if they're not
enabled at the moment).

When scheduler groups are disabled, the GuC uses the values from Group 0.

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/20251218223846.1146344-23-daniele.ceraolospurio@intel.com