drm/xe/pf: Allow bulk change all VFs EQ/PT using sysfs

drm/xe/pf: Allow bulk change all VFs EQ/PT using sysfs

It is expected to be a common practice to configure the same values
of execution quantum and preemption timeout parameters across all VFs.

Add write-only sysfs attributes that will apply required EQ/PT values
globally, without forcing admin to update PF and each VF separately.

  /sys/bus/pci/drivers/xe/BDF/
  ├── sriov_admin/
      ├── .bulk_profile
      │   ├── exec_quantum_ms		[WO] unsigned integer
      │   └── preempt_timeout_us	[WO] unsigned integer

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patch.msgid.link/20251030222348.186658-11-michal.wajdeczko@intel.com