drm/xe/pf: Enable per-function engine activity stats

drm/xe/pf: Enable per-function engine activity stats

Enable per-function engine activity stats when VF's are enabled
and disable when VF's are disabled

v2: fix commit message
    remove reset stats from pf config (Michal)

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250311071759.2117211-4-riana.tauro@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>