drm/xe/pf: Disable VFs on remove

We shouldn't leave VFs enabled when unloading the PF driver.
Otherwise we will get a message like:

 [ ] xe 0000:4d:00.0: driver left SR-IOV enabled after remove

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/20240626111827.1389-2-michal.wajdeczko@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>