drm/xe/pf: Perform fair scheduling auto-provisioning

Default VF scheduling configuration is the same as for the PF and
includes unlimited execution quantum (EQ) and unlimited preemption
timeout (PT). While this setup gives the most flexibility it does
not protect the PF or VFs from other VF that could constantly submit
workloads without any gaps that would let GuC do a VF-switch.

To avoid that, do some trivial auto-provisioning and configure PF
and all VFs with 16ms EQ and PT. This setup should allow GuC to
perform a full round-robin with up to 63 VFs within 2s, which in
turn should match expectations from most of the VMs using VFs.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com> #v1
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patch.msgid.link/20260402191726.4932-14-michal.wajdeczko@intel.com

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