drm/xe/pf: Add support to configure GuC SR-IOV policies

There are few knobs inside GuC firmware to control VFs scheduling.
Add basic functions to support their reconfigurations.
We will start using them shortly once we prepare debugfs.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240410170338.1199-6-michal.wajdeczko@intel.com