drm/xe/pf: Add functions to provision scheduling priority

drm/xe/pf: Add functions to provision scheduling priority

We already have function to configure PF (or VF) scheduling priority
on a single GT, but we also need function that will cover all tiles
and GTs.

However, due to the current GuC FW limitation, we can't always rely
on per-GT function as it actually only works for the PF case. The
only way to change VFs scheduling priority is to use 'sched_if_idle'
policy KLV that will change priorities for all VFs (and the PF).

We will use these new functions in the upcoming patches.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patch.msgid.link/20251030222348.186658-12-michal.wajdeczko@intel.com